27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
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Contribution List

Displaying 354 contributions out of 354
Type: Talk Session: Gamma Rays
Track: Galactic
In the light of new data regarding the high-energy $\gamma$-ray emission of suspected massive star colliding-wind binary systems, magneto-hydrodynamic simulations can now be refined and adapted in order to provide explanation of past and prediction of future emission characteristics of these sources. We use three-dimensional magneto-hydrodynamic modeling to investigate the structure and condit ... More
Presented by Dr. Klaus REITBERGER on 28 Aug 2018 at 3:05 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G01
The upcoming Cherenkov Telescope Array (CTA) will provide a significant improvement in both sensitivity and angular resolution compared to current generation imaging atmospheric Cherenkov telescopes. A key science goal of CTA is a survey of the entire Galactic plane. Outcomes of this survey include a census of Galactic gamma-ray source populations (SNR, PWNe, binaries, etc...), identifying po ... More
Presented by Joshua CARDENZANA on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter
S. TALBAOUI, H. GRIMECH, E. BAQLOUL, M.HABBAD Laboratory of Materials Physics, Faculty of Sciences and Technologies, Sultan Moulay Slimane University, Beni Mellal, Morocco Abstract One of the most important issues in astrophysics and cosmology is understanding the nature of dark matter. One possibil ... More
Presented by Mr. said TALBAOUI on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G02
For the HAWC Collaboration. Supernova Remnants (SNRs) have long been postulated to be the main sources of Galactic Cosmic Rays (CRs) up to the knee. However, while some SNRs have been shown to be CR accelerators, none of them have been confirmed to accelerate CRs beyond hundreds of TeV. The TeV gamma-ray emission from SNRs provides important information about the maximum energies to which CRs a ... More
Presented by Dr. Henrike Fleischhack FLEISCHHACK on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM17
Revealing the nature of Dark Matter (DM) is a key objective of the current physical paradigm. Due to its predicted DM density at sub-pc distances, the Galactic Center should have a high number of DM interactions, making it a primary astrophysical source for DM studies. Various particle theories predict that DM annihilations over astrophysical scales can result in a gamma-ray flux. VERITAS is a ter ... More
Presented by Mr. Nathan KELLEY-HOSKINS on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
With the detection of the binary neutron star merger GW170817 a new era of multi-messenger astronomy started. GW170817 proved that neutron star mergers are ideal laboratories to constrain the equation of state of cold supranuclear matter, to study the central engines of short GRBs, and to understand the origin and production of heavy elements. In this talk, we discuss how the last millisecond ... More
Presented by Dr. Tim DIETRICH on 28 Aug 2018 at 5:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR19
Traditionally for the extensive air shower arrays, the reconstruction of the gamma-ray induced air showers properties: such as core, energy and the depth of the shower maximum (X$_{max}$) is done by the model-dependent fit of the observed lateral amplitude distribution. This approach has certain disadvantages owing to the limitations of the fit models and procedures. To ameliorate this, we pres ... More
Presented by Mr. Vikas JOSHI on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmology
Track: Cosmology
Primordial Magnetic Fields (PMFs), being present before the epoch of cosmic recombination, induce small-scale baryonic density fluctuations. These inhomogeneities lead to an inhomogeneous recombination process which alters the peaks and heights of the large-scale anisotropies of the Cosmic Microwave Background (CMB) radiation. Utilizing numerical compressible MHD calculations based on kinetic cons ... More
Presented by Dr. Andrey SAVELIEV on 28 Aug 2018 at 2:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
A detailed multi-messenger study of the high-energy emission from the Galactic plane is possible nowadays thanks to the observations provided by gamma and neutrino telescopes. We show the potential of this approach by using the total gamma flux from the galactic plane measured by HESS at 1TeV and in the longitude range −75° < l < 60°. We compare the HESS observational data with expectations fo ... More
Presented by Prof. Francesco VILLANTE on 30 Aug 2018 at 4:35 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The synchrotron spectrum of the Crab Nebula has long been a mystery: rather than having one cooling break, there are at least two breaks: around 1E14 Hz, and around 1E16 Hz. The spectrum cuts off around 1E21 Hz. The break around 1E14 Hz can be explained by synchrotron cooling, but the second break is rather enigmatic and various explanations have been offered, often involving the presence ... More
Presented by Dr. Jacco VINK on 30 Aug 2018 at 4:49 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The origin and nature of ultrahigh-energy cosmic rays (UHECRs) are one of the most intriguing mysteries in Astroparticle Physics. The two giant observatories, Telescope Array Experiment and Pierre Auger Observatory, are steadily observing UHECRs in both hemispheres. We highlight their latest results and address the requirements for a next-generation observatory. The Fluorescence detector Array o ... More
Presented by Dr. Toshihiro FUJII on 28 Aug 2018 at 3:15 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
The precision of the new generation of cosmic-ray (CR) experiments, such as AMS-02, PAMELA, CALET, and ISS-CREAM, is now reaching the percent level in a wide energy range from GeV/n (per nucleon) to multi-TeV/n. A precise understanding of cosmic-rays production and propagation as well as stringent constraints on dark matter are guaranty results from a precise interpretation of the measured fluxe ... More
Presented by Mr. Yoann GÉNOLINI on 29 Aug 2018 at 2:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The idea that primordial black holes (PBHs) of O(10) solar mass can account for most of the dark matter has been recently reconsidered after the discovery of gravitational waves from binary-black hole merger events. I present a significant update of a robust bound on this scenario based on a conservative modeling of the gas accretion and the subsequent radio and X-ray emission originating by a po ... More
Presented by Dr. Daniele GAGGERO on 30 Aug 2018 at 5:05 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
We present the results of a systematic search in the AGILE quick-look database for transient gamma-ray sources above 100 MeV that are temporally and spatially coincident with published high-energy neutrino IceCube events. AGILE is a small scientific mission of the Italian Space Agency (ASI) in cooperation with INAF, INFN, CIFS, and with the participation of several Italian companies and Universi ... More
Presented by Ms. Carlotta PITTORI on 31 Aug 2018 at 2:00 PM
Type: Talk Session: Extragalactic
Track: Plenary
Follows soon.
Presented by Dr. Kohta MURASE on 28 Aug 2018 at 11:00 AM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N03
Over the last few years the IceCube Neutrino Telescope has reported the first observations of an high-energy astrophysical neutrino flux. Recently, these observations have been strengthened by the publication of a sample of 82 high-energy starting events (HESE), and 36 high-energy muon neutrino tracks. Many different scenarios for the astrophysical origin of the IceCube neutrinos have been explore ... More
Presented by Mr. Andrea TURCATI on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: GW and followup Board #: GW04
The detection of an electromagnetic signal by Fermi-GBM, temporally and spatially coincident with the first detection of a gravitational wave (GW) coming from a neutron star merger (NSM) by LIGO-Virgo, set a new milestone in multi-messenger astronomy. It enabled an unprecedented follow-up campaign of the event that allowed the identification and monitoring of the source. With improved sensitivitie ... More
on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Follows soon.
Presented by Fabio AMBROSINO on 29 Aug 2018 at 2:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
We present the Advanced Energetic Pair Telescope (AdEPT) which is being developed as a future NASA/GSFC MIDEX mission to perform high-sensitivity medium-energy (5–200 MeV) astronomy and revolutionary gamma-ray polarization measurements. The enabling technology for AdEPT is a large volume gaseous time projection chamber with high spatial resolution 2-dimentional readout. The accurate 3-dimension ... More
Presented by Dr. Andrey TIMOKHIN on 27 Aug 2018 at 4:50 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM11
The High Altitude Water Cherenkov Observatory (HAWC) is a very high energy (500 GeV to 100 TeV) gamma ray detector located in southern Mexico. HAWC has both a wide field of a view and near-continuous duty cycle, making it ideal for unbiased sky surveys. We use HAWC data to perform such a search for gamma ray signals from "dark dwarfs"; dark matter sub-halos with no optical counterpart. There sh ... More
Presented by Mr. Joseph LUNDEEN on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N08
The IceCube neutrino observatory is a 1 km³ detector deployed deep into the Antarctic ice sheet. While IceCube has recently discovered a diffuse astrophysical flux of high energy neutrinos, its source is yet to be identified. With a field of view covering the whole sky and continuous data-taking, IceCube is capable of detecting transient sources when one or more high-energy neutrinos arrive, and ... More
Presented by Mr. Thomas KINTSCHER on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Particle Physics Board #: PP03
The transport of Ultra-High Energy Cosmic Rays (UHECR) through photon target fields requires a model for photo-nuclear interactions. The photo-meson energy regime around 150 MeV in nucleus rest frame is relevant for the production of pions off UHECR nuclei and successively for astrophysical and cosmogenic neutrinos. The models in present theoretical calculations, including codes like CRPropa, use ... More
Presented by Leonel MOREJON on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
Follows soon.
Presented by Dr. Philip COWPERTHWAITE on 28 Aug 2018 at 5:25 PM
Type: Talk Session: Cosmic-rays
Track: Plenary
Antimatter cosmic rays have become a fashionable tool to probe for the presence of dark matter particles in the Milky Way. Should these species exist, they would annihilate or decay, hence producing positrons and anti-nuclei which would distort the conventional signals expected at the Earth. But are these backgrounds well known? There’s the rub. Regardless of the dark matter problem, anti-mat ... More
Presented by Prof. Pierre SALATI on 30 Aug 2018 at 11:30 AM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Particle Physics Board #: PP02
The use of gravitational time delays of macro-lenses to constrain the photon mass and the Lorentz Invariance Violation scale is investigated. The influence of photon masses on the measured time delays of macro-lenses is derived. The sensitivity of time delays to the photon mass is illustrated by a bound obtained from 3 AGN which have measurements in several passbands. The bound obtained is compara ... More
Presented by Jean-François GLICENSTEIN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Atmospheric neutrinos are of interest as a beam for the study of neutrino properties and as a foreground in the search for astrophysical neutrinos. An accurate understanding of their flux is important for both. Uncertainties in the flux of atmospheric neutrinos arise from composition and spectrum of the primary cosmic radiation and from imperfect knowledge of hadronic interactions. Both aspects ... More
Presented by Thomas GAISSER on 30 Aug 2018 at 5:25 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The Pierre Auger Observatory with its exposure provides us with a large set of excellent data. The analysis of these data has led to major breakthroughs in the last decade, but a coherent interpretation has not yet been achieved. New questions have emerged, including that of the composition of cosmic rays in the energy region of the flux suppression, which is of key importance for making progress. ... More
Presented by Prof. Daniele MARTELLO on 28 Aug 2018 at 3:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmology Board #: CR09
In multi-field reheating after modular $j$-inflation we investigate the conditions under which baryogenesis via non-thermal leptogenesis can be successfully realized. We introduce three heavy right-handed neutrinos to the non-supersymmetric standard model of particle physics, assuming hierarchical neutrino masses. Considering a typical mass for the first right-handed neutrino of the order of $10^{ ... More
Presented by Dr. Nelson VIDELA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Global properties of the almost one hundred millisecond pulsars (MSPs) detected in gamma-rays by the Fermi Large-Area Telescope remain relatively unknown due to multiple large uncertainties. I present here a extensive Bayesian analysis of both the spatial distribution and luminosity function simultaneously. Distance uncertainties, arising from errors in the parallax measurement or Galactic electro ... More
Presented by Mr. Thomas EDWARDS on 29 Aug 2018 at 5:35 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: GW and followup Board #: GW03
The observation of gravitational waves from binary black hole mergers has renewed interest in the possibility of primordial black holes (PBHs) that are around 10 to 100 times more massive than the Sun. Such PBHs may form large numbers of binaries before matter-radiation equality and, if these binaries survive until today, they may contribute to the merger rate observable by LIGO and Virgo. Howeve ... More
Presented by Dr. Bradley KAVANAGH on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Motivated by neutrino astronomy, we consider a plane wave of coupled and massive flavours, scattered by a static black hole, and describe analytically and numerically the corresponding oscillation probability in the surrounding space. Both the interpretation as particles travelling along geodesics and as scattered waves are studied, and consistently show a non-trivial and potentially long range ... More
Presented by Dr. Jean ALEXANDRE on 29 Aug 2018 at 3:10 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM15
Cosmological inflation generates primordial density perturbations which are scale-free on observable scales but that may be considerably larger on smaller scales. The boosted power spectrum at small scales leads to increased formation of dense, small-scale structure at early times, enhancing the present-day annihilation rate of annihilating dark matter. In this work, we show how to compute the imp ... More
Presented by Mr. Joshua FOSTER on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM01
Models of TeV-scale dark matter are severely constrained by increasingly precise direct detection experiments. One paradigm which can evade these bounds is Inelastic Dark Matter (iDM), where a nontrivial dark sector contains two particles with a small mass splitting $\delta$. A typical example is a supersymmetric model in which the two lightest Higgsinos have TeV-scale masses, and the heavier one ... More
Presented by Dr. Joshua EBY on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
High-energy astrophysical neutrinos, with TeV--PeV energies, are acutely sensitive to the existence of potential new flavor-dependent interactions with the electrons around them. For the first time, we probe this possibility by looking for deviations in the flavor composition of the astrophysical neutrinos seen by IceCube. At these energies, the relative contribution of standard oscillations is w ... More
Presented by Dr. Mauricio BUSTAMANTE on 29 Aug 2018 at 3:25 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The theoretical interpretation of dark matter experiments is hindered by uncertainties of the dark matter density and velocity distribution inside the Solar System. In order to quantify those uncertainties, we present a parameter that characterizes the deviation of the true velocity distribution from the Maxwell-Boltzmann form, and we then determine for different values of this parameter the most ... More
Presented by Andreas RAPPELT on 29 Aug 2018 at 5:00 PM
Type: Talk Session: Galactic Science
Track: Galactic
PWN make up the majority of the identified galactic TeV sources and are a key ingredient to understand the high energy sky. In this contribution, I will review recent progress in magnetohydrodynamic and particle transport modeling of PWN, highlighting advances with fully three-dimensional global models. It is now clear that the MHD kink- and Kelvin Helmholtz-type instabilities lead to turbulent fl ... More
Presented by Dr. Oliver PORTH on 31 Aug 2018 at 2:00 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The Cosmic Ray (CR) physics has entered a new era driven by high precision measurements coming from direct detection (especially AMS-02 and PAMELA) as well as gamma-ray observations (Fermi-LAT) which requires the development of more refined models for the CR acceleration and propagation. In this talk I will present a model for the generation of the Galactic magnetic halo where Cosmic Rays propagat ... More
Presented by Dr. Giovanni MORLINO on 29 Aug 2018 at 4:15 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Fast Radio Bursts (FRBs) are mysterious radio transients that occur at a prodigious rate of $\approx 10^3$ events per day above fluences of 1 Jansky-ms in the entire sky. Arriving from cosmological distances ($\sim$Gpc), FRBs show potential to be novel probes of cosmological parameters, the ionized baryon distribution, and the magnetic fields around and between galaxies. We do not know the origins ... More
Presented by Dr. Shriharsh TENDULKAR on 30 Aug 2018 at 2:20 PM
Type: Talk Session: Cosmic-rays
Track: Plenary
I will present an overview of recent developments in numerical modelling of CR transport in our Galaxy. Corresponding numerical models aim at reproducing CR spectra and also diffuse gamma-ray emission from the Galaxy. For these numerical models we witness a transition from two-dimensional azimuthally symmetric models to those that use a more realistic description of our Galaxy. Focusing on results ... More
Presented by Ralf KISSMANN on 30 Aug 2018 at 11:00 AM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G07
One of the major scientific objectives of the future Cherenkov Telescope Array (CTA) Observatory is the search of PeVatrons. PeVatrons are the cosmic-ray factories able to accelerate nuclei at least up to Peta-electronvolt (1 PeV = 10$^{15}$ eV) energies. CTA will perform the first survey of the full Galactic plane at TeV energies and beyond with unprecedented sensitivity. The determination of eff ... More
Presented by Dr. Ekrem Oguzhan ANGÜNER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
We have previously argued that the probability for the detection of individual neutrinos from individual blazars is expected to scale with the long-term fluence rather than short flares of high gamma-ray flux. Recently, the extremely high energy (EHE) muon neutrino event IceCube-170922A was found to coincide with increased gamma-ray emission from the blazar TXS 0506+056. We use short- and long-ter ... More
Presented by Mr. Michael KRETER on 27 Aug 2018 at 5:35 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Almost 10 years of observations with the Fermi Large Area Telescope (LAT) have revealed extreme gamma-ray outbursts from flat spectrum radio quasars (FSRQs), temporarily making these objects the brightest gamma-ray emitters in sky. Yet, the location and mechanisms of the gamma-ray emission remain elusive. Here, we characterize the brightest flares of six FSRQs observed with the LAT. We find eviden ... More
Presented by Dr. Manuel MEYER on 29 Aug 2018 at 4:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR08
In this presentation, the performance of a template-based event reconstruction algorithm will be shown for the first time for the Cherenkov Telescope Array (CTA), the next gen- eration ground-based instrument for gamma-ray astronomy. In the Image Pixel-wise fit for Atmospheric Cherenkov Telescopes (ImPACT) the charge measured in each camera pixel of each telescope during an extended air shower ... More
Presented by Mrs. Sabina PÜRCKHAUER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Due to the large amounts of energy they release, the luminous transients called Gamma-Ray Bursts (GRBs) are of great interest for high energy astroparticle physics. In the fireball internal shock scenario, the prompt high energy emission is generated in collisions between regions of the jet with different Lorentz factors. However, the classical internal shock model faces several difficult ... More
Presented by Annika RUDOLPH on 27 Aug 2018 at 5:10 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM02
We propose a simple theory for the idea that cosmological dark matter (DM) may be present today mainly in the form of stable neutral hadronic thermal relics. In our model neutrino masses arise radiatively from the exchange of colored DM constituents, giving a common origin for both dark matter and neutrino mass. The exact conservation of B−L symmetry ensures dark matter stability and the Dirac n ... More
Presented by Prof. Diego RESTREPO on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
A signal of high-energy extraterrestrial neutrinos from unknown source(s) was recently discovered by the IceCube experiment. Neutrinos are always produced together with γ-rays, but the γ-ray flux from extragalactic sources is suppressed due to attenuation in the intergalactic medium. We report a γ-ray excess at high Galactic latitudes starting at energies 300 GeV in the data of the Fermi telesc ... More
Presented by Michael KACHELRIESS on 29 Aug 2018 at 5:50 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Cosmic Rays
The study of UHECR is challenged by both the rarity of events and the difficulty in modelling their production, propagation and detection. The physics behind these processes is complicated, requiring high-dimensional models which are impossible to fit to data using traditional methods. Whilst non-trivial, it is indeed possible to directly fit realistic, physical models to the UHECR data. The combi ... More
Presented by Ms. Francesca CAPEL on 31 Aug 2018 at 3:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The discovery of dark matter (DM) at XENONnT or LZ would place constraints on DM particle mass and coupling constants. It is interesting to ask when these constraints can be compatible with thermal production of DM. We address this question within the most general set of renormalizable models that preserve Lorentz and gauge symmetry, and that extend the standard model by one DM candidate of mass $ ... More
Presented by Martin KRAUSS on 28 Aug 2018 at 3:30 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Coherent neutrino-nucleus scattering can provide stringent constraints on generalised effective neutrino-quark interactions. While neutrino-quark non-standard interactions (NSI) represent a subset of these generalised interactions, in full generality they may include all possible four-fermion Lorentz structures. Depending on their strength, these new interactions can sizably modify the co ... More
Presented by Valentina DE ROMERI on 29 Aug 2018 at 3:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Installed on the ISS in August 2015 and taking data since October of that year, CALET (CALorimetric Electron Telescope) is directly measuring the electron+positron cosmic-ray spectrum up into the TeV-region with fine energy resolution and good proton rejection. The latest published total electron+positron spectrum is analyzed for Dark Matter signatures. Limits on annihilation and decay of Dark Mat ... More
Presented by Dr. Holger MOTZ on 30 Aug 2018 at 5:35 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM09
The recent results of the EDGES collaboration indicate that during the era of reionization, the primordial gas was much colder than expected. The cooling of the gas could be explained by interactions between dark matter (DM) and particles in the primordial gas. Constraints from cosmology and particle experiments indicate that this DM should be light (~10-80 MeV), mili-charged, and only make up a s ... More
Presented by Ms. Niki KLOP on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR22
The 9.7m Schwarzschild-Couder (SC) medium-sized telescope is a candidate for the Cherenkov Telescope Array (CTA). It exploits a novel aplanatic two-mirror optical design to provide a large field of view of 8 degrees and improved angular resolution across the whole field of view compared to single-mirror designs. In addition, the reduced plate scale of the camera allows the use of compact, high qua ... More
Presented by Mr. Andrii PETRASHYK on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
An excess of cosmic positrons above 10 GeV with respect to the spallation reaction of cosmic rays (CRs) with the interstellar medium has been measured by Pamela, Fermi-LAT and with unprecedented precision by the AMS-02 experiment. Various interpretations have been invoked to interpret this excess, such as production from supernova remnants, pulsar wind nebulae (PWNe) and dark matter. A dominant co ... More
Presented by Dr. Mattia DI MAURO on 30 Aug 2018 at 3:08 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Diffusive shock acceleration (DSA) at supernova remnant (SNR) shock fronts is thought to accelerate galactic cosmic rays (CRs) to energies below the knee, while an extragalactic origin is presumed for CRs with energies beyond the ankle. CRs with energies between $3 \times 10^{15}$ and $10^{18}$ eV, which we dub the ``shin," have an unknown origin. In this talk, I will outline our recent theoretica ... More
Presented by Chad BUSTARD on 29 Aug 2018 at 5:23 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
The LHCb experiment has the unique possibility, among the LHC experiments, to be operated in fixed target mode using its internal gas target. The energy scale achievable at the LHC and the excellent detector capabilities for vertexing, tracking and particle identification allow a wealth of novel measurements of great interest for cosmic ray physics. In particular, using a helium target, th ... More
Presented by Giacomo GRAZIANI on 30 Aug 2018 at 2:15 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
IceTop is the surface component of the IceCube Observatory at the South pole and consists of ice-cherenkov detector stations at the top of IceCube's strings. The air shower data are analyzed to study the cosmic ray spectrum and composition in the energy range from PeV to EeV. The shower size $S_{125}$ from IceTop alone can be used as a proxy for estimating the primary energy, and unfolded with ... More
Presented by Dr. Matthias PLUM on 28 Aug 2018 at 2:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Experimental observations of Galactic and extragalactic cosmic rays in the last decade challenge the theoretical description of both the sources and the transport of cosmic rays. The latest version of the publicly available simulation framework CRPropa 3.2 aims at a consistent solution of the cosmic-ray transport problem, including the production and propagation of secondary neutrinos and elec ... More
Presented by Mr. Lukas MERTEN on 29 Aug 2018 at 5:06 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Cosmic Rays
We present a combined fit of the Auger spectrum and composition based on a newly developed code for the extragalactic propagation of cosmic ray nuclei (PriNCe). This very efficient numerical solver of the transport equations allows for scans over large ranges of unknown UHECR source parameters. Here, we present a study of a generalized source population with three parameters (rigidity-dependent ... More
Presented by Mr. Jonas HEINZE on 31 Aug 2018 at 2:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
There is a substantial effort in the physics community to search for dark matter interactions with the Standard Model of particle physics. Collisions between dark matter particles and baryons exchange heat and momentum in the early Universe, enabling a search for dark matter interactions using cosmological observations in a parameter space that is highly complementary to that of direct detection. ... More
Presented by Dr. Kimberly BODDY on 27 Aug 2018 at 5:30 PM
Type: Talk Session: Cosmology
Track: Cosmology
The Zwicky Transient Facility (ZTF) has started operating earlier this year and is continuously discovering transients throughout the norther sky. Over the course of its three-year survey we expect to find thousands of supernovae, including 2000 type Ia supernovae at low redshifts (z < 0.1) with high-quality lightcurves needed for determining cosmological distances. Such a sample will be essential ... More
Presented by Mr. Ulrich FEINDT on 30 Aug 2018 at 4:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The sub-GeV mass region of the dark matter is foreseeably to be explored intensively in the next generation of direct detection experiments. Essig and others [1] recently discussed the feasibility of detecting the dark-matter electron recoil using low-noise semiconductor detectors as the active target. With a readout noise level below one electron RMS, the sensitivity allows us to test several the ... More
Presented by Prof. Jochen SCHIECK on 28 Aug 2018 at 3:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM13
If DM interacts with nucleons and/or electrons it can be trapped by astrophysical objects such as the Sun or neutron stars. Elastic scattering of a DM particle with ordinary matter can in particular reduce the kinetic energy of the DM particle when it passes through these stars, such that its speed passes below the corresponding escape velocity. Once gravitationally trapped, DM undergoes further s ... More
Presented by Mr. Yoann GÉNOLINI on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Recently, the DAMA/LIBRA collaboration released updated results from their search for the annual modulation signal from Dark Matter scattering in the detector. Besides approximately doubling the exposure of the DAMA/LIBRA data set, the updated photomultiplier tubes of the experiment allow to lower the recoil energy threshold to 1 keV electron equivalent from the previous threshold of 2 keV electro ... More
Presented by Sebastian BAUM on 28 Aug 2018 at 2:20 PM
Type: Talk Session: Dark Matter
Track: Plenary
The distribution of Dark Matter in galaxies is one remarkable output of structure formation in a cosmological context, and an important input for the searches of the nature of Dark Matter. In this talk I will present the results of recent, fully data-driven analysis of the determination of the Dark Matter content in the Milky Way. I will also show how the uncertainties obtained with this observati ... More
Presented by Dr. Fabio IOCCO, Dr. Fabio IOCCO on 29 Aug 2018 at 12:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Observations of high-energy gamma rays are one of the most promising tools to constrain or reveal the nature of dark matter. During the remarkable ten years of the Fermi satellite mission, the data from its Large Area Telescope (LAT) were used to set constraints on the dark matter cross section to various particle channels which cut well into the theoretically motivated region of the parameter spa ... More
Presented by Gabrijela ZAHARIJAS on 31 Aug 2018 at 2:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Indirect searches for dark matter with the ground-based MAGIC telescopes will be reviewed. Different targets with a large expected dark matter content, such as galaxy clusters and dwarf satellite galaxies, allow to constrain dark-matter annihilation/decay processes up to the TeV mass scale. Latest results from deep observations of the galaxy cluster Perseus and the dwarf spheroidal Ursa Major II w ... More
Presented by Dr. Monica VAZQUEZ ACOSTA on 27 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM06
In collider experiments, such as the Large Hadron Collider, an unknown particle could be produced from a pair of quarks in proton-proton collisions. In simplified dark matter models, this particle could then decay either into WIMP (Weakly-Interacting Massive Particles) dark matter or into Standard Model particles, acting as a mediator between ordinary matter and dark matter. From such a simplified ... More
on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
LUX-ZEPLIN (LZ) is a second-generation dark matter experiment currently under construction. It will follow LUX in the 1480-m deep Sanford Underground Research Facility in South Dakota, with a projected sensitivity for the spin-independent cross section of $1.6\times10^{-48}~$cm$^{2}$ for a 40 GeV/c$^2$ mass Weakly Interacting Massive Particle (WIMP) after 1000 live-days exposure of a 5.6-tonne fid ... More
Presented by Dr. Alfredo TOMAS ALQUEZAR on 29 Aug 2018 at 5:15 PM
Type: Talk Session: Cosmology
Track: Cosmology
Measurements of the CMB and future 21-cm results can set significant constraints on dark matter annihilation or decay. To obtain such limits, a good understanding of how dark matter energy injection affects the ionization and thermal history of the universe is crucial. In this talk, I will present a new and open-source code package called `DarkHistory`, which will compute these histories efficient ... More
Presented by Mr. Hongwan LIU on 28 Aug 2018 at 3:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
We present a radically new version of the widely used DarkSUSY package, which allows to compute the properties of dark matter particles numerically. With DarkSUSY 6 one can accurately predict a large variety of astrophysical signals from dark matter, such as direct detection in low-background counting experiments and indirect detection through antiprotons, antideuterons, gamma-rays and positrons f ... More
Presented by Prof. Torsten BRINGMANN on 29 Aug 2018 at 5:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
We present a new parametrisation of the cosmic-ray flux and its mass composition over an energy range from 1 GeV to 10^11 GeV. We combine measurements of the flux of individual elements from high-precision satellites and balloon experiments with indirect measurements of mass groups from the leading air shower experiments. We provide the first fit of this kind that consistently takes both statistic ... More
Presented by Dr. Hans DEMBINSKI on 28 Aug 2018 at 4:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
On September 22, 2017, the IceCube Neutrino Observatory has observed for the first time ever an extremely high-energy neutrino IceCube-170922 in spatial and temporal coincidence with a gamma-ray flaring blazar, TXS 0506+056, observed with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. Following the original IceCube alert, the source has been observed by several telescopes ... More
Presented by Anna FRANCKOWIAK on 27 Aug 2018 at 2:20 PM
Type: Talk Session: Galactic Science
Track: Gamma-rays
PSR J2032+4127 is a young gamma-ray pulsar located in the same direction as the extended TeV gamma-ray source TeV J2032+4130. The pulsar has recently been discovered to be in a 45-50 year period, highly eccentric binary orbit with the Be star MT91 213. Periastron occurred in November 2017 and over this period an intense observational campaign was conducted by the TeV gamma-ray telescope arrays VER ... More
Presented by Dr. Ralph BIRD on 31 Aug 2018 at 3:00 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Galaxy clusters are thought to grow by accreting mass through large scale, strong yet elusive, virial shocks. These collisionless shocks are thought to accelerate relativistic electrons, generating a spectrally-flat leptonic virial ring. However, with the exception of a VERITAS signal from the Coma cluster, attempts to detect virial rings have all failed. By stacking and rescaling Fermi-LAT data a ... More
Presented by Mr. Ido REISS on 30 Aug 2018 at 2:40 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Now we are in the era of multi-messenger astronomy including neutrinos and gravitational waves. However, the observational window for gamma rays between 100 keV to a few tens of MeV is still closed. This energy band can bring a key information on astrophysical phenomena such as the nuclear decaying gamma-ray lines from stellar explosions, e$^-$e$^+$ annihilation line, MeV dark matter and so on. ... More
Presented by Mr. Hiroki YONEDA on 27 Aug 2018 at 4:35 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The GAPS experiment is designed to carry out a dark matter search by hunting for low-energy cosmic-ray antideuterons with a novel detection approach. So far not a single cosmic antideuteron has been detected by any experiment, but well-motivated theories beyond the standard model of particle physics contain viable dark matter candidates, which could lead to a significant enhancement of the antideu ... More
Presented by Dr. Ralph BIRD on 27 Aug 2018 at 5:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
We propose a new method to search for axion-like particles (ALPs) based on the gamma-rays produced concomitant with high-energy astrophysical neutrinos. The existence of high-energy neutrinos implies production of gamma-rays in the same sources. Photons can convert into ALPs in the sources' magnetic fields, and will travel as ALPs through extragalactic space. Back-conversion in the Milky Way's mag ... More
Presented by Dr. Ranjan LAHA on 27 Aug 2018 at 4:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Various observations are revealing the widespread occurrence of fast and powerful winds in active galactic nuclei (AGNs) that are distinct from relativistic jets, likely launched from accretion disks and interacting strongly with the gas of their host galaxies. During the interaction, strong shocks are expected to form that can accelerate nonthermal particles to high energies. Such winds have been ... More
Presented by Dr. Ruoyu LIU on 27 Aug 2018 at 3:35 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The IceCube neutrino observatory has firmly established the existence of an astrophysical high-energy neutrino component. This discovery was made using the high energy starting events sample (HESE), which uses a veto to significantly reduce atmospheric background. In this talk I will present the latest astrophysical neutrino flux measurement using seven years of HESE. This latest iteration of the ... More
Presented by Mr. Austin SCHNEIDER on 27 Aug 2018 at 4:35 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G03
The very young Supernova remnant G1.9+0.3 is an interesting target for next generation gamma-ray observatories. So far the remnant is only detected in the radio and the X-ray bands but its young age and inferred shock speed of 14,000km/s should make it an efficient particle accelerator. We carry out spherical symmetric 1-D simulations where we simultaneously solve the transport equations for the ... More
on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Observations at cosmological and astronomical scales indicate that the majority of matter in our Universe is in the form of non-relativistic and long-lived dark matter. Its observed relic abundance is consistent with the existence of a neutral, massive particle with little or no self-interaction. A dark matter candidate favoured by extensions of the Standard Model is a Weakly Interacting Massive P ... More
Presented by Mr. Julien WULF on 28 Aug 2018 at 2:00 PM
Type: Talk Session: Dark Matter
Track: Plenary
Follows soon.
Presented by Teresa MARRODAN on 29 Aug 2018 at 11:00 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
The CRESST-III (Cryogenic Rare Event Search with Superconducting Thermometers) experiment, located in the Gran Sasso underground laboratory (LNGS, Italy), aims at the direct detection of dark matter (DM) particles. Scintillating CaWO$_4$ crystals operated as cryogenic detectors at mK temperatures are used as target material for elastic DM-nucleus scattering. The simultaneous measurement of the p ... More
Presented by Paolo GORLA on 28 Aug 2018 at 2:40 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM05
A variety of experiments have been developed over the past decades, aiming at the detection of Weakly Interactive Massive Particles (WIMPs) via their scattering in an instrumented medium. The sensitivity of these experiments has improved with a tremendous speed, thanks to a constant development of detectors and analysis methods. Detectors capable of reconstructing the direction of the ... More
Presented by Prof. A. MURAT GULER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
On September 22, 2017, the IceCube Neutrino Observatory has observed for the first time ever an extremely high-energy neutrino IceCube-170922 spatially and temporally consistent with a  gamma-ray flaring blazar, TXS 0506+056. The region around the event is, however, crowded with several other thermal and non-thermal sources. In order to get a clear picture of the possible neutrino counterpart ... More
Presented by Mr. Theo GLAUCH on 27 Aug 2018 at 3:05 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
A key prediction of the standard cosmological model -- which relies on the assumption that dark matter is cold, i.e. non-relativistic at the epoch of structure formation -- is the existence of a large number of dark matter substructures on sub-galactic scales. This assumption can be tested by studying the perturbations induced by dark matter substructures on cold stellar streams. Here, we study th ... More
Presented by Dr. Nilanjan BANIK on 30 Aug 2018 at 4:35 PM
Type: Talk Session: Highlights
Track: Plenary
The light emitted by all galaxies across the history of the Universe is encoded in the intensity of the extragalactic background light (EBL), the diffuse cosmic radiation field at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for high-energy γ rays via the photon-photon interaction (γγ → e+e−), leaving a characteristic attenuation imprint in the spectra of d ... More
Presented by Dr. Marco AJELLO on 31 Aug 2018 at 12:15 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Electromagnetic cascading of TeV-band gamma-ray emission from distant blazars is a means to investigate the amplitude of magnetic field in the voids of intergalactic space. The flux of cascade emission from some objects is weaker than it should be, leaving two interpretation. The magnetic field may be strong enough to deflect the electron-positron pairs out of the line of sight. Alternatively plas ... More
Presented by Martin POHL on 30 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR13
In the past 15 years, Cherenkov Telescopes have detected various minute-scale flares of AGNs in the energy range above 100 GeV. This important sample allows for measurements of corresponding light curves and energy spectra leading to a precise determination of possible photon energy dependent time delays. Analyses were performed in order to study possible effects of these distant and variable ... More
Presented by Mr. Cédric PERENNES on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR14
Obtaining the energy spectrum of an astrophysical source is crucial for our understanding of the source properties and the underlying physical principles, e.g. the acceleration of cosmic rays. In Imaging Air Cherenkov Astronomy and neutrino astronomy, however, the reconstruction of spectra is hindered by the fact, that the energy of the primary particle cannot be accessed experimentally, but has t ... More
Presented by Mr. Mirko BUNSE on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
An anomalous, apparently diffuse, gamma-ray signal not readily attributable to known Galactic sources has been found in Fermi space telescope data covering the central ~10 degrees of the Galaxy. This "Galactic Center Gamma-Ray Excess" (GCE) signal has a spectral peak at ~2 GeV and reaches its maximum intensity at the Galactic Centre (GC) from where it falls off as a radial power law ~r^{-2.4}. Giv ... More
Presented by Roland CROCKER on 31 Aug 2018 at 2:20 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
MGRO J1908+06 is an unidentified bright TeV source. It has been proposed to be one of the most likely neutrino sources. However, no counterpart of MGRO J1908+06 has been detected at other wavelengths, and its nature remains unknown. PSR J1907+0602 is a 106.6 ms gamma-ray pulsar with high spin down power (∼ 2.8×10^36 erg/s) and is spatially associated with MGRO J1908+06. By analyzing Fermi/LAT ... More
Presented by Dr. Jian LI on 30 Aug 2018 at 5:40 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N09
Among the various categories of AGN, blazars, and especially BL-Lacs, are the prime candidate sources of TeV astrophysical neutrinos, due to their high luminosity at very high-energy (VHE) range, and high and frequent activity periods. In their flaring state, non-thermal emission is expected through the Synchrotron Self-Compton (SSC) of the electron populations, however a contribution related to ... More
Presented by Ankur SHARMA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
In the last decades significant progress has been made towards understanding the origin and nature of ultra-high-energy cosmic rays (UHECRs). However, their sources and composition still remain largely unknown. To interpret the data and find the elusive sources of UHECRs, it is important to understand how cosmic rays propagate in the universe. This is not a trivial task, given our limited knowledg ... More
Presented by Rafael ALVES BATISTA on 27 Aug 2018 at 4:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR20
Axion-like particles (ALPs) are very light, neutral, pseudo-scalar bosons which are supposed to interact with two photons. They can give rise to very interesting astrophysical effects taking place in the very-high energy band and above (10 GeV – 1000 TeV) when an external magnetic field is present. We analyze the propagation of the photon-ALP beam generated as pure photons at the jet base o ... More
Presented by Dr. Giorgio GALANTI on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Fermi Large Area Telescope (LAT) has provided the largest sample of solar flares with emission greater than 30 MeV to date. These include the detection of the prompt and the delayed emission, in some cases extending up to ~20 hrs. The LAT detected in gamma-rays also three flares placed behind the limb of the visible part of the Sun. These detections are shedding light on the particle accelerat ... More
Presented by Francesco LONGO on 28 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR02
First-order Fermi particle acceleration in supernova remnant (SNR) shocks is generally considered as the most likely production mechanism for the bulk of the cosmic rays (CRs), i.e., those with energies below the knee at $\sim 10^{15}$ eV. The SNR origin of higher energy CRs remains uncertain since the shock speeds of typical SNRs are too small to produce CRs above $\sim 10^{16}$ eV in the time an ... More
Presented by Prof. Don ELLISON on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmology
Track: Cosmology
I will present the measurement of an absorption feature in the sky-averaged radio spectrum centered at 78 MHz with the EDGES experiment. The measured feature is broadly consistent with the absorption of photons from the microwave background by neutral hydrogen gas in the intergalactic medium (IGM) due to significant star formation about 180 million years after the Big Bang. Despite this consistenc ... More
Presented by Dr. Raul MONSALVE on 30 Aug 2018 at 4:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Particle Physics Board #: PP04
The Micro-X High Resolution Microcalorimeter X-Ray Imaging Rocket is a sounding rocket mission that launched on July 22, 2018. This was the first successful operation of Transition Edge Sensors (TESs) and SQUID Time-Division Multiplexing in space. This milestone demonstrates the flight readiness of these technologies and establishes a new type of detector for X-ray astronomy. Micro-X is designed t ... More
Presented by Antonia HUBBARD on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
TON 0599 (z=0.7247) is the latest addition to a limited club of flat spectrum radio quasars (FSRQs) detected in very high energy (VHE, E > 100 GeV) gamma rays. Its redshift makes it the third farthest source, filling the gap in the redshift distribution of the VHE gamma ray emitters. It was detected for the first time with the MAGIC telescopes on 2017/12/15. The observations were triggered by hard ... More
Presented by Dr. Tomislav TERZIĆ on 30 Aug 2018 at 3:10 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR05
The High Altitude Water Cherenkov (HAWC) γ-ray observatory is fully operational since march 2015 in central Mexico. It is a Water Cherenkov Detector (WCD) consisting of 300 tanks filled with purified water, each instrumented with 4 photomultiplier tubes. They record, via the cherenkov light produced in the water, the secondary particles from atmospheric air showers of energy ranging from 0.1 to 1 ... More
Presented by Ms. Armelle JARDIN-BLICQ on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N02
I will present a flavor and energy inference analysis (Astroparticle Physics, Volume 101, 2018) for each high-energy neutrino event observed by the IceCube observatory during six years of data taking. For each event the main observables in the IceCube detector are the deposited energy and the event topology (showers or tracks) produced by the Cherenkov light by the transit through a medium of char ... More
Presented by Mr. Giacomo D'AMICO on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Many limitations in understanding important aspects of hadron collisions become most visible in the forward phase space at colliders. This is where the contributing physics is most soft, however, at the same time the energy transport is by far largest. This is why this region is in particular important for astroparticle physics. The CASTOR calorimeter at CMS has performed a series of measurements ... More
Presented by Ralf ULRICH on 30 Aug 2018 at 2:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
In recent years several space-based instruments have probed the sky in hard X rays (E∼10–100 keV: NuSTAR, Swift, INTEGRAL) and in gamma rays (E∼0.1-1000 GeV: Fermi-LAT, AGILE) with considerable scientific return. On the other hand, the challenging energy band between these regimes has remained mostly unexplored since COMPTEL on CGRO (1991-2000). I will review the proposals for future space-b ... More
Presented by Riccardo RANDO on 27 Aug 2018 at 4:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Progress in finding the origin of ultra-high-energy cosmic rays (UHECRs) will come from discovering the secondary UHE neutrinos produced in UHECR interactions. Yet, the flux of UHE neutrinos may lie beyond the reach of existing detectors and their possible upgrades. GRAND is a planned large-scale UHE observatory designed to discover UHE neutrinos even if their flux is low. It will do so by measuri ... More
Presented by Mauricio BUSTAMANTE on 28 Aug 2018 at 5:20 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N07
Progress in finding the origin of ultra-high-energy cosmic rays (UHECRs) will come from discovering the secondary UHE neutrinos produced in UHECR interactions. Yet, the flux of UHE neutrinos may lie beyond the reach of existing detectors and their possible upgrades. GRAND is a planned large-scale UHE observatory designed to discover UHE neutrinos even if their flux is low. It will do so by meas ... More
Presented by Dr. Mauricio BUSTAMANTE on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Extragalactic Board #: EG05
Fermi-LAT observations have proven that GeV gamma-ray emission is a relatively common feature for many gamma-ray bursts (GRBs). However, the relatively low effective area of space detectors implies low statistics for the highest energy photons which impedes detailed physical interpretation. The highest energy photon detected by LAT reached 95 GeV, a range which is well within reach for ground-base ... More
Presented by Ms. Ruiz-Velasco EDNA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: GW and followup
Track: Plenary
Follows soon.
Presented by Brian METZGER on 27 Aug 2018 at 9:00 AM
Type: Talk Session: GW and followup
Track: Plenary
Follows soon.
Presented by Eleonora TROJA on 27 Aug 2018 at 10:00 AM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR16
On behalf of the SGSO Consortium. The field of Very-High-Energy (VHE, E>100 GeV) gamma-ray astronomy is entering an era of precision measurements. Over the last decade, innovations in instrumentation have led to a drastically improved understanding of the most energetic objects in the Universe. New results by the High Altitude Water Cherenkov Observatory (HAWC) have shown the unique insights th ... More
Presented by Dr. Henrike Fleischhack FLEISCHHACK on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Galactic Science
Track: Galactic
Progress in observation and theory allows to study Galactic sources of Cosmic Rays in ever increasing numbers, variety and phenomenological complexity. We are presently witnessing the complement of deep studies of individual sources by population aspects, and Galactic source physics reaching out into the extragalactic domain. Some source classes presently evade generalization owing to uniqueness ( ... More
Presented by Olaf REIMER on 27 Aug 2018 at 2:00 PM
Type: Talk Session: Galactic Science
Track: Galactic
Star formation in galaxies appears to be self-regulated by energetic feedback processes. Among the most promising agents of feedback are cosmic rays (CRs), the relativistic ion population of interstellar and intergalactic plasmas. In these environments, energetic CRs are virtually collisionless and interact via collective phenomena mediated by kinetic-scale plasma waves and large-scale magnetic fi ... More
Presented by Prof. Christoph PFROMMER on 29 Aug 2018 at 2:30 PM
Type: Talk Session: Gamma Rays
Track: Plenary
Follows soon.
Presented by Prof. Werner HOFMANN on 29 Aug 2018 at 9:00 AM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
PMN J1603−4904 is only the second confirmed young radio galaxy (compact symmetric object) that has been detected with *Fermi*-LAT. These objects, which may transition into larger radio galaxies, are a stepping stone to understanding AGN and jet evolution. It is not clear how they can produce high-energy γ rays. We present multiwavelength observations, including a spectral energy distribution (S ... More
Presented by Dr. Felicia KRAUSS on 30 Aug 2018 at 2:55 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Observations performed by the Large Area Telescope (LAT) on board of the Fermi Gamma-ray Space Telescope around the IC170922A region revealed a flaring gamma-ray blazar, TXS 0506+056, in spatial and temporal coincidence with the neutrino event detected by the IceCube Neutrino Observatory. Archival searches of other historical, well-reconstructed high-energy neutrino events have revealed further po ... More
Presented by Simone GARRAPPA on 31 Aug 2018 at 2:17 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Fermi bubbles (FBs) are two large lobes observed in gamma rays up to 55 degrees above and below the Galactic center. Although the FBs were discovered 8 years ago, their origin is still unknown. Even the process of production of the gamma rays: leptonic inverse Compton scattering or interactions of hadronic cosmic rays with gas, is not yet known. Answering the questions of the origin of the FBs ... More
Presented by Dr. Dmitry MALYSHEV on 29 Aug 2018 at 5:05 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
Follows soon.
Presented by Mr. Eric BURNS on 28 Aug 2018 at 4:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
We report the detection of diffuse gamma-ray emissions towards several massive star clusters in our Galaxy. The detailed spectral and spatial analysis reveal a remarkable constancy of the energy and radial distribution of the cosmic ray density, w(E; r) ~ E^2.3 r^{-1} around these massive star clusters. The 1/r decrement of the CR density with the distance from the star cluster is a distinct si ... More
Presented by Dr. Ruizhi YANG on 28 Aug 2018 at 4:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Blazars are active galactic nuclei which have their relativistic particle jet pointing towards Earth and have been observed to emit gamma rays to very high energies. They are also candidates for the yet-unknown accelerators of ultra-high-energy cosmic rays. In such a scenario, their gamma-ray emission might be associated with neutrinos produced by hadronic interactions in the jet. Correlating the ... More
Presented by Christoph RAAB on 27 Aug 2018 at 5:50 PM
Type: Talk Session: Gamma Rays
Track: Plenary
Follows soon.
Presented by Laura CHOMIUK
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR02
Gamma-ray emitting FR I type radio galaxies are expected to be aligned at large angles to the line of sight. We consider a scenario which naturally explains the energetic gamma-ray emission from radio galaxies. It is proposed that two emission regions are present in the jet at this same moment, the inner fast moving blob produces radiation strongly collimated along the jet axis and the outer bl ... More
Presented by Prof. Wlodek BEDNAREK on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR03
gamma-ray astronomy is polarization-blind as no significant polarimetry of a cosmic source has been performed since the [OSO-8 measurement on the Crab nebula][1] in the X-ray band. gamma-ray polarimetry would enable to [tag the curvature-synchrotron radiation transition in pulsars][2], to [decipher leptonic from hadronic radiation models for blazars][3] .. and [much more][4]. We [demonstrate ... More
Presented by Dr. Denis BERNARD on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
In this talk I will summarize the current astrophysical results from searching for binary black hole mergers in data taken from second generation gravitational wave observatories. I will focus on estimates of binary parameters found with Bayesian inference techniques and state-of-the art waveform models which describe the inspiral, merger and ringdown phases of these coalescences. I will illustrat ... More
Presented by Dr. Michael PÜRRER on 30 Aug 2018 at 5:35 PM
Type: Talk Session: Cosmology
Track: Cosmology
Strong gravitational lenses with measured time delays between the multiple images can be used to determine the Hubble constant that sets the expansion rate of the Universe. Measuring the Hubble constant is crucial for inferring properties of dark energy, spatial curvature of the Universe and neutrino physics. I will describe techniques for measuring the Hubble constant from lensing with a realist ... More
Presented by Prof. Sherry SUYU on 28 Aug 2018 at 2:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
I will present a well-motivated dark matter scenario that naturally predicts a strong emission of gravitational waves in the Early Universe. Interplay with Higgs physics as well as the corresponding dark matter phenomenology will be discussed.
Presented by Dr. Camilo Alfredo GARCIA CELY on 30 Aug 2018 at 4:50 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
The FSRQ 3C 279 (z=0.536) is a well known bright variable blazar. In recent years it has undergone several luminous outbursts detected at all wavelengths. Here we highlight the results of H.E.S.S. observations of two types of events of different nature during the year 2017 and in January 2018. The first Target of Opportunity followed the external trigger from the ATOM optical telescope that ... More
Presented by Carlo ROMOLI on 29 Aug 2018 at 5:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR06
The governing process behind the variability of blazars is still unknown. Hence, the collection of long-term data on individual sources is an important step in order to unlock this unknown. The flat spectrum radio quasar (FSRQ) PKS 1510-089 has been observed by H.E.S.S. at VHE gamma-rays (E>100GeV) since the discorvery in 2009. A much denser monitoring effort has been started in 2015 in order to a ... More
Presented by Dr. Michael ZACHARIAS on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Small Magellanic Cloud is the second-nearest star-forming galaxy to our Milky Way at a distance of about 60 kpc with major star-formation episodes at 6 Gyr, 0.7 Gyr and 10 Myr ago. This makes the Small Magellanic Cloud an ideal target to study objects related to young stellar populations over a wide range of age. The Magellanic Clouds are currently the only galaxies for which individual sourc ... More
Presented by Ms. Maria HAUPT on 28 Aug 2018 at 5:50 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR23
PKS 1830-211 is a known macrolensed AGN located at a redshift of z=2.5. Its high energy gamma ray emission has been detected with the Fermi-LAT instrument and evidence for lensing was obtained by several authors from its high energy data.?Aims. Observations of PKS 1830-211 were taken with the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes in August 2014, following a flare alert by the ... More
Presented by Jean-François GLICENSTEIN on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR12
Fabian Schüssler on behalf of the H.E.S.S. Collaboration The detection of an astrophysical flux of high-energy neutrinos by IceCube is a major step forward in the search for the origin of cosmic rays, as this emission is expected to originate in hadronic interactions taking place in or near cosmic-ray accelerators. No neutrino point sources, or significant correlation with known astrophysical ... More
Presented by Dr. Fabian SCHUSSLER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmology
Track: Plenary
Follows soon.
Presented by Mickael RIGAULT on 31 Aug 2018 at 10:00 AM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Nearby electron and positron accelerators, especially Pulsar Wind Nebulae, have been proposed as potential origins of the local multi-GeV positron excess. The HAWC Gamma-Ray Observatory has reported very extended TeV gamma-ray emission around two nearby middle-aged pulsars Geminga and B0656+14, suggesting ultra-relativistic electrons and positrons accelerated in our backyard. The gamma-ray profile ... More
Presented by Dr. Hao ZHOU on 29 Aug 2018 at 9:45 AM
Type: Talk Session: Galactic Science
Track: Galactic
HESS J1826$-$130 is an unidentified very-high-energy (VHE, E>0.1 TeV) gamma-ray source discovered by H.E.S.S. along the Galactic plane. The analysis of 215-hour H.E.S.S. data has revealed a steady TeV source with an extension of 0.21°. The source spectrum can be well described with a power-law function, showing a very hard spectral index of $\Gamma$ = 1.8 and an exponential cut-off at ~15 TeV. Th ... More
Presented by Dr. Ekrem Oguzhan ANGÜNER on 27 Aug 2018 at 3:30 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The $\eta$ Carinae binary system hosts one of the most massive stars and has the highest known mass-loss rate. This dense wind encounters the much faster wind expelled by the stellar companion, dissipating mechanical energy in the shock. In these regions, particles are accelerated to very-high-energies via diffusive shock acceleration and subsequently cooled via inverse-Compton and photo-pion prod ... More
Presented by Mr. Matteo BALBO on 28 Aug 2018 at 2:50 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR18
Cygnus X-1 is the first Galactic source confirmed to host a black hole and has been observed since then across the whole electromagnetic spectrum. Recently, it was also detected in the 0.1-10 GeV band by Fermi/LAT and possibly detected at low significance by MAGIC during a flare. The source's non-thermal radiation is thought to originate from the relativistic jets launched by the black hole becaus ... More
Presented by Mr. Dimitrios KANTZAS on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR01
AR Scorpii, close binary system of a rotation powered white dwarf and a low mass M type companion star, shows non-thermal emission extending up to the X-ray energy range. We propose that relativistic electrons and hadrons can be accelerated in a strongly magnetised, turbulent region formed in collision of a rotating white dwarf magnetosphere and a dense atmosphere of the M dwarf star. The non-ther ... More
Presented by Prof. Wlodek BEDNAREK on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Neutrinos
The existence of an astrophysical neutrino flux at TeV to PeV energies has now been firmly established by the IceCube collaboration. However, the sources responsible for this flux have not yet been identified. The most important candidates, steady emitting blazars and transient gamma-ray bursts, favoured on the basis of their high gamma-ray luminosity, are now ruled out as the dominant source popu ... More
Presented by Matthias VEREECKEN on 31 Aug 2018 at 3:30 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR12
The High Energy Stereoscopic System (H.E.S.S.) is an array of Cherenkov telescopes in Namibia and operates in the energy range from a few tens of GeV to more than 50 TeV. Most of the very-high-energy sources visible with H.E.S.S. emit gamma rays with energies up to tens of TeV. Nominal analysis methods, however, are optimised for the TeV energy range and achieve the best sensitivity at $\sim$1 TeV ... More
Presented by Mrs. Iryna LYPOVA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
Last year, LIGO-VIRGO collaborations reported detection of the first neutron star merger event, GW170817, which accompanied with observations of electromagnetic counterparts from radio to gamma rays. High-energy gamma rays and neutrinos were not observed. However, the mergers of neutron stars are expected to produce these high-energy particles. In this talk, I will discuss the prospects for coinci ... More
Presented by Dr. Shigeo KIMURA on 30 Aug 2018 at 6:10 PM
Type: Talk Session: Cosmology
Track: Cosmology
In this talk, we discuss the relation between the strength of the self-interaction of dark matter (SIDM) particles and the predicted properties of the inner density distributions of dark matter (DM) halos. We present the results of N-body simulations for 28 halos performed for the same initial conditions for cold DM and for SIDM with different cross-sections. We provide a simple phenomenological ... More
Presented by Ms. Anastasia SOKOLENKO on 28 Aug 2018 at 2:30 PM
Type: Talk Session: Neutrino Astronomy
Track: Plenary
on behalf of the Fermi-LAT coll.
Presented by Dr. Sara BUSON on 27 Aug 2018 at 11:30 AM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
We present a search for neutrino emission from Galactic TeV gamma-ray sources detected by the HAWC Observatory. HAWC serves as an excellent instrument to complement IceCube with its energy range extending to very high energies where we expect neutrinos correlated with the gamma-rays observed by HAWC, assuming that the highest energy photons originate from the decay of pions. Using 8 years of IceCu ... More
Presented by Joshua WOOD on 30 Aug 2018 at 4:55 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Since its discovery of the astrophysical neutrino flux, the IceCube Neutrino Observatory has continued to provide invaluable knowledge about both potential neutrino sources and neutrino properties at the GeV-PeV scale through its detection of neutrino interactions via Cherenkov radiation in the deep South Pole ice. In addition, IceCube is a strong partner in the field of multi-messenger ... More
Presented by Summer BLOT on 27 Aug 2018 at 4:15 PM
Type: Talk Session: Cosmology
Track: Cosmology
Gravitational lensing represents a unique tool to study the dark Universe. Small distortions in the images of galaxies caused by the gravitational lensing effect of the matter distribution in the Universe can be detected over the whole sky. Measuring these coherent distortions makes dark matter structures "visible", allows us to study their growth over cosmic time, and yields cosmological ins ... More
Presented by Hendrik HILDEBRANDT on 28 Aug 2018 at 2:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N04
Many neutrino interactions measured by the IceCube Neutrino Observatory produce only hadronic showers, which appear as almost point-like light emission due to the large detector spacing (~125m). At PeV energies these showers often saturate the PMTs closest to the interaction vertex - thus the reconstruction has to rely on more diffused photons which requires precise understanding of the optical ... More
Presented by Mr. Christian HAACK on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Some recent studies exposed rather strong statistical evidence of in-vacuo-dispersion-like spectral lags for gamma-ray bursts (GRBs), a linear correlation between time of observation and energy of GRB particles. Those results focused on testing in-vacuo dispersion for the most energetic GRB particles, and in particular only included photons with energy at emission greater than 40 GeV. We here exte ... More
Presented by Mr. Michele RONCO on 31 Aug 2018 at 2:51 PM
Type: Talk Session: Dark Matter
Track: Plenary
Follows soon.
Presented by Francesca CALORE on 29 Aug 2018 at 11:30 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
TeV photons provide unique tests of fundamental physics phenomena, such as dark matter annihilation and decay. The High Altitude Water Cherenkov (HAWC) Observatory is an extensive air shower array sensitive to gamma rays from 500 GeV - 100 TeV. HAWC is capable of performing indirect dark matter searches in a mass range that is inaccessible to most other experiments. The HAWC wide field-of-view ena ... More
Presented by Pat HARDING on 27 Aug 2018 at 2:40 PM
Type: Talk Session: Cosmology
Track: Cosmology
The robustness of inflation to inhomogeneous initial conditions for matter fields and the spacetime metric is under investigation. If inflationary expansion fails to begin under sufficiently inhomogeneous initial conditions, such that inflation requires fine-tuning of its initial state to occur, then its naturalness is challenged. I will present results for the range of initial conditions which gi ... More
Presented by Patrick FITZPATRICK on 30 Aug 2018 at 5:00 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
The Standard Model of particle physics have been extremely successful so far, but there are still many unanswered questions like the origin of neutrino mass, nature of dark matter, the source of quark and lepton flavor mixing and their possible correlation, the theory of grand unification of all SM interactions. In this talk I will focus on some interesting models that attempt to answer these ques ... More
Presented by Oleg POPOV on 29 Aug 2018 at 3:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
On September 22nd 2017, the IceCube Neutrino Observatory reported a muon track from a neutrino with a very good positional accuracy. The alert triggered a number of astronomical follow-up campaigns, and the Fermi gamma-ray telescope found as counterpart an object named TXS0506+056 in a very bright, flaring state; this observation may be the first direct evidence for an extragalactic source of very ... More
Presented by Dr. Shan GAO on 27 Aug 2018 at 3:20 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Electrons and positrons play a special role among cosmic ray (CR) species. Most strikingly, their strong energy losses in the Galactic magnetic and radiation fields severely limit their propagation distances. Therefore electrons and positrons offer invaluable insights into the local properties of CR acceleration and propagation. In this talk we present our model for their interstellar spectra over ... More
Presented by Dr. Andrea VITTINO on 30 Aug 2018 at 2:51 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
PKS 1510-089 is one of only a handful of flat spectrum radio quasars detected in very high energy (VHE, E > 100 GeV) gamma rays. Since the first detection in 2009, despite showing strong variability in the optical and GeV range, no VHE gamma-ray variability could be claimed until a moderate 5-fold increase of the VHE gamma-ray flux was observed in 2015. In May 2016, a major VHE gamma-ray fla ... More
Presented by Dr. Julian SITAREK on 29 Aug 2018 at 4:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Extragalactic Board #: EG03
Studying the arrival times of γ-ray photons according to their energy puts constraints fundamental physics such as Lorentz Invariance Violation (LIV) signatures but can also provide specific information about the emitting sources themselves. Observing the time evolution of AGN spectra can significantly constrain *in situ* physical parameters and radiative processes at work. A synchrotron-self ... More
Presented by Mr. Cédric PERENNES on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR29
Very-high-energy (VHE) photon detections from Gamma-ray bursts (GRBs) can provide compelling evidences about the radiative processes, physical composition of the ejecta and acceleration processes. The synchrotron radiation can only explain photons with energies less than < 10 GeV. In the framework of GRB fireball, we present a theoretical model based on synchrotron self-Compton forward shocks to ... More
Presented by Dr. Nissim FRAIJA on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR07
The Crab nebula provides exceptionally bright non-thermal emission across the entire wavelength range from radio to the most energetic photons. The spatial and spectral structure of the non-thermal synchrotron emission is known in exceptional detail. The inverse Compton emission of the nebula has just recently been spatially resolved. In this work, we reexamine the inverse Compton scattering mo ... More
Presented by Mrs. Ludmilla DIRSON on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Galactic Science
Track: Galactic
Massive Star clusters and Super bubbles in star forming regions (SFRs) have been postulated as possible sources of cosmic rays in our galaxy. At the interaction sites of stellar winds of O type stars, charged particles can be accelerated to TeV energies. One possible example of this is a Fermi-LAT cocoon, an extended region of gamma-ray emission detected by Fermi-LAT and attributed to a cocoon of ... More
Presented by Binita HONA on 29 Aug 2018 at 3:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM03
A new measurement of a spatially extended gamma-ray signal from the center of M31 recently reported that the emission broadly resembles the Galactic center excess (GCE) of the Milky Way (MW). In this contribution, we discuss the possibilities that the signal originates from a population of millisecond pulsars (MSPs), or alternatively the annihilation/decay of dark matter (DM) particles. An astrop ... More
Presented by Mr. Christopher ECKNER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The catalogue of TeV gamma-ray emitting objects includes about 80 extragalactic sources, among which most are blazars. Only a few of them belong to the class of radio galaxies or misaligned blazars. The latter includes PKS 0625-354, an object that was detected in very high energy gamma rays within only 5.5 hours of H.E.S.S. observations. Along with the H.E.S.S. observations, PKS 0625-354 was ... More
Presented by Dr. Alicja WIERZCHOLSKA on 29 Aug 2018 at 3:00 PM
Type: Talk Session: Cosmology
Track: Cosmology
Exclusion of several classes of models due to LHC and astroparticle data has revived interest in grand unification. Typical unified theories predict topological defects. We study a particular SUSY SO(10) model which can produce transitory domain walls near grand unification scale, comparable to the scale of onset of low field inflation. While topologically not stable, the D-parity domain walls are ... More
Presented by Prof. Urjit YAJNIK on 28 Aug 2018 at 3:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Recently it has been reported by the IceCube detector, which is installed under the thick Antarctic ice, evidence of the existence of a high-energy flow of cosmic neutrinos. Today, the scientific community requires that a neutrinos telescope located in the northern hemisphere verify and complete the results of IceCube, so as to allow observation of high-energy neutrinos across the sky. The Medit ... More
Presented by Pasquale MIGLIOZZI on 29 Aug 2018 at 2:00 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Collisionless shocks are found in a number of astrophysical objects, ranging in size from the Earth's bow shock through solar flares, termination shock of the solar wind, supernova remnant shocks, and merger shocks in galaxy clusters. In the latter case, low Mach number (Ms << 10) shocks are found propagating in a high beta (β > 1) plasmas, where β is the ratio of thermal to magnetic pressure. O ... More
Presented by Dr. Jacek NIEMIEC on 27 Aug 2018 at 4:55 PM
Type: Talk Session: Particle Physics
Track: Plenary
Follows soon.
Presented by JiJi FAN on 30 Aug 2018 at 9:30 AM
Type: Talk Session: Particle Physics
Track: Plenary
Follows soon.
Presented by Beate HEINEMANN on 30 Aug 2018 at 9:00 AM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
At energies approaching the Planck energy scale $10^{19} GeV$, several quantum-gravity theories predict that familiar concepts such as Lorentz (LIV) symmetry can be broken. Such extreme energies are currently unreachable by experiments on Earth, but for photons traveling over cosmological distances the accumulated deviations from the Lorentz symmetry may be measurable using the Cherenkov Telesco ... More
Presented by Mr. Hassan ABDALLA on 29 Aug 2018 at 5:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
In this work, the photon horizon including LIV is studied by correcting the pair-production interaction of gamma-ray with the Cosmic Background Light. The derived scenarios are used to predict important changes in the propagation of photons with energy greater than 10 ^ 18 eV. We have computed the GZK photon flux on Earth for several ultra high energy cosmic ray source (UHECR) models and we compar ... More
Presented by Dr. Humberto MARTÍNEZ-HUERTA on 29 Aug 2018 at 5:40 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The Pierre Auger Observatory in Argentina is the world's largest observatory for measuring ultra-high energy cosmic rays with an observation area of 3000 km2. The atomic nuclei arriving from outer space reach the highest energies observed in nature. Clues to their origin come from studying the distribution of their arrival directions. We discuss an anisotropy observed at more than the 5 sigma leve ... More
Presented by Prof. Martin ERDMANN on 28 Aug 2018 at 2:00 PM
Type: Talk Session: Highlights
Track: Plenary
Follows soon.
Presented by Eun-Suk SEO on 31 Aug 2018 at 11:15 AM
Type: Talk Session: Particle Physics
Track: Particle Physics
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a cylindrical compact structure of 19 towers. The construction of the experiment and, in particular, the installation of all towers in the cryosta ... More
Presented by Dr. Giovanni BENATO on 30 Aug 2018 at 3:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The Large Underground Xenon (LUX) detector was a dual-phase xenon Time Projection Chamber with an active mass of 250 kg searching for Weakly Interacting Massive Particle (WIMP) dark matter via direct detection. It operated at the Sanford Underground Research Facility (SURF) in Lead, South Dakota from 2012 to 2016. LUX has published three previously world leading limits on the spin-independent cros ... More
Presented by M. I. LOPES on 29 Aug 2018 at 4:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
In this talk, we present the latest results on dark matter searches using the High Energy Stereoscopic System (H.E.S.S.) located in Namibia. Dark matter is searched for looking for high-energy gamma-ray events in the most promising regions of the sky. Dark matter particles could self-annihilate and produce high-energy gamma rays, either as spectral lines or as continous spectrum. The inner region ... More
Presented by Dr. Vincent POIREAU on 30 Aug 2018 at 2:20 PM
Type: Talk Session: Highlights
Track: Plenary
The extremely accurate charged cosmic-ray data recently provided by the AMS collaboration and the gamma-ray data from Fermi-LAT and other experiments allowed to enter a new era of precision measurements in the CR field, and offer for the first time the unique opportunity to investigate different transport properties in different regions of the Galaxy. I will review the status of the field, the mos ... More
Presented by Dr. Daniele GAGGERO on 31 Aug 2018 at 12:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N11
The blazar TXS 0506+056, spatially consistent with the IceCube neutrino alert IC170922A, was in a flaring state during the time of the neutrino alert. Multiwavelength follow-up observations were carried out. In this contribution, the SED of TXS 0506+056 is modeled in the context of a leptohadronic one-zone model to investigate the dominant radiation mechanism during the flare. The compatibility of ... More
on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The origin and observed abundance of Dark Matter can be explained elegantly by the thermal freeze-out mechanism, leading to a preferred mass range for Dark Matter particles in the ~MeV-TeV region. The GeV-TeV mass range is being explored intensively by a variety of experiments searching for Weakly Interacting Massive Particles. The sub-GeV region, however, in which the masses of the building block ... More
Presented by Ruth POETTGEN on 27 Aug 2018 at 5:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below, across an azimuthal range of about 80 degrees. This allows to search for a signature of particle showers induced by earth-skimming cosmic tau neutrinos in the PeV to EeV ... More
Presented by Dariusz GORA on 29 Aug 2018 at 2:40 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The inclusive flux of cosmic electrons and positrons is now known with unprecedented precision up to few tens of TeV. Very recent data from AMS-02, DAMPE, CALET, FERMI and HESS suggest that the flux starts deviating from a single power law at TeV energies, with the presence of a break at around 1 TeV. In addition, new stringent upper bounds on the dipole anisotropy of the inclusive flux have been ... More
Presented by Silvia MANCONI on 30 Aug 2018 at 2:17 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Extragalactic Board #: EG01
About fifty (Mrk 421, Mrk 501, 1ES 1959+650 and others) northern TeV extragalactic sources have been discovered during last twenty five years. Most of them (2/3) we are monitoring in Abastumani Observatory during 20 years using 125-cm and dedicated 70-cm meniscus telescopes. All observations (over 3100 nights) have been conducted with Apogee Ap6E and SBIG ST-6 CCD cameras in BVRI bands. The frames ... More
Presented by Prof. Omar KURTANIDZE on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Recent results from the Pierre Auger Collaboration have shown that the composition of ultrahigh- energy cosmic rays (UHECRs) becomes gradually heavier with increasing energy. Although gamma- ray bursts (GRBs) have been promising sources of UHECRs, it is still unclear whether they can account for the Auger results because of their unknown nuclear composition of ejected UHECRs. In this work, we revi ... More
Presented by Mr. Bing Theodore ZHANG on 28 Aug 2018 at 5:19 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
We provide the first systematic study of the low-scale leptogenesis scenario in the minimal Standard Model extended with 3 right-handed neutrinos having masses at the GeV scale. We highlight and discuss the differences between the 2- and the 3-right-handed neutrino cases, the major qualitative distinction being the possibility, in the latter scenario, of probing part of the parameter space at the ... More
Presented by Dr. Michele LUCENTE on 29 Aug 2018 at 3:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
On 22$^{\text{nd}}$ September 2017, a high energy neutrino was detected by the IceCube observatory in spatial coincidence with the blazar TXS 0506+056, which was observed to be flaring in the GeV band by the Fermi-LAT telescope. This coincidence triggered a series of multi-wavelength observations by several telescopes on ground and in space. On 24$^{\text{th}}$ September 2017, the MAGIC telesco ... More
Presented by Luca FOFFANO on 29 Aug 2018 at 2:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM12
Direct detection experiments are one of a few primary avenues for the potential detection of particle Dark Matter (DM). We introduce general new statistical methods to systematically study the model-discrimination power of these (and many other) instruments. In a nutshell, our approach allows one to study all possible benchmark models at once making general conclusions possible. As an application ... More
Presented by Mr. Thomas EDWARDS on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmology Board #: CR08
We show a global existence theorem for Gowdy symmetric spacetimes with a positive potential as a model for inflationary cosmology from string/M-theory. Also, asymptotic behaviour of the spacetimes is investigated. Asymptotically velocity terms dominated solutions near the initial singularity are constructed and the future asymptotic behaviour of the spacetimes is analysed. These resu ... More
Presented by Prof. Makoto NARITA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The Dark Matter Particle Explorer (DAMPE) is a high energy astroparticle satellite launched on the 17th December 2015 into a sun-synchronous orbit at an altitude of 500 km. The DAMPE detector consists of a double layer of Plastic Scintillator strips Detector (PSD), followed by a Silicon-tungsten TracKer-converter (STK), a Bismuth Germanium Oxide electromagnetic calorimeter (BGO) and a NeUtron Dete ... More
Presented by Ms. Stefania VITILLO on 27 Aug 2018 at 2:00 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Although designed to observe neutrinos from astrophysical sources at TeV-PeV energies, IceCube and its DeepCore in-fill array also observe large numbers of atmospheric neutrinos in the 5-50 GeV range, permitting measurements of the “atmospheric” neutrino mixing parameters in a higher energy range complementary to measurements from long-baseline neutrino beam experiments. As these energies are ... More
Presented by Tyce DEYOUNG on 30 Aug 2018 at 5:40 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The new approach to investigations of inclined muon bundles, based on the local muon density spectra (LMDS) phenomenology allows to study primary cosmic rays in a wide energy interval from 10^15 up to 10^19 eV. The features of the proposed method for studying EAS are discussed. The transverse dimensions of EAS rapidly increase with increasing of the zenith angle and, hence, EAS in a wide energy in ... More
Presented by Prof. Igor YASHIN on 28 Aug 2018 at 3:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Dwarf spheroidal galaxies are are exceptionally clean targets for searches for gamma rays from dark matter annihilation. Here, I will discuss a general, model-independent formalism for determining bounds on the production of photons from dark matter annihilation in dwarf spheroidal galaxies. This formalism is applicable to any set of assumptions about dark matter particle physics or astrophysics ... More
Presented by Pearl SANDICK on 27 Aug 2018 at 3:15 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
We study evolution of dark matter substructures, especially how they lose the mass and change density profile after they fall in gravitational potential of larger host halos. We develop an analytical prescription that models the subhalo mass evolution and calibrate it to results of N-body numerical simulations of various scales from very small (Earth size) to large (galaxies to clusters) halos. We ... More
Presented by Shin'ichiro ANDO on 27 Aug 2018 at 4:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G05
Vela Jr. (RX J0852.0−4622) is one of just a few known supernova remnants (SNRs) with a resolved shell across the whole electromagnetic spectrum from radio to very-high-energy (> 100 GeV) gamma-rays. The proximity and large size of the remnant allow for detailed spatially resolved studies of its emission and spectrum. Detection of thin bright filaments at X-ray energies places constraints on part ... More
Presented by Dr. Iurii SUSHCH on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR25
Since the detection of non-thermal radio emission from the bow shock of a massive runaway star simple models have predicted high-energy emission from these Galactic sources. In this work we develop a more sophisticated model for the non-thermal emission from massive run-away star bow shocks. The main goal is to establish whether these systems are efficient non-thermal emitters or they are not capa ... More
Presented by Dr. Maria Victoria DEL VALLE on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Since the detection of non-thermal radio emission from the bow shock of a massive runaway star simple models have predicted high-energy emission from these Galactic sources. In this work we develop a more sophisticated model for the non-thermal emission from massive run-away star bow shocks. The main goal is to establish whether these systems are efficient non-thermal emitters or they are not capa ... More
Presented by Dr. Maria Victoria DEL VALLE on 28 Aug 2018 at 5:35 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
We use a time-dependent numerical model to calculate the prompt GRB emission (spectra and light curves) in GeV/TeV energy range. The emission is modelled by combining a time-dependent radiative code, solving for the electron and photon distributions, with a dynamical code calculating the evolution of the physical conditions in the shocked regions of the outflow. The microphysics parameters and th ... More
Presented by Zeljka BOSNJAK on 31 Aug 2018 at 3:08 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The current generation of Imaging Atmospheric Cherenkov Telescopes has its resolution power limited to few arcminute scale. Recently, new simulations and analysis techniques, applied to H.E.S.S. observations, made possible the measure of the extension of very high energy (VHE; E > 100 GeV) gamma-ray sources below one arcminute. The improved understanding of the point spread function (PSF) of H ... More
Presented by Dr. David SANCHEZ on 29 Aug 2018 at 9:30 AM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Cosmic Rays
The Pierre Auger Observatory is the world’s largest cosmic-ray detector, sensitive to cosmic rays with energy exceeding $\sim 10^{17}$ eV. In addition to charged cosmic rays that form the bulk of the cosmic-ray flux at ultra-high energies, Auger is sensitive to ultra-high energy neutral messengers (photons, neutrinos, and neutrons). The latter are particularly exciting as they are expected to ar ... More
Presented by Dr. Foteini OIKONOMOU on 31 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR28
The SED of high-peaked BL Lacs is generally understood as a composition of synchrotron radiation in X-rays and self-synchrotron emission peaking at energies higher than MeV originated in one emission zone. Although most of the observations are well described by this model, orphan flares, lack of correlation between X-rays and gamma-rays and a broader SED in the gamma ray regime challenge the model ... More
Presented by Dr. Maria Magdalena GONZALEZ, Dr. Nissim FRAIJA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Over the years, significant efforts have been devoted to the understanding of the radio emission of extensive air shower (EAS) in the range [20-80] MHz but, despite some studies led until the nineties, the [1-10] MHz band has remained unused for nearly 30 years. At that time it has been measured by some pioneering experiments but also suggested by theoretical calculations that EAS could produce a ... More
Presented by Mr. Antony ESCUDIE on 27 Aug 2018 at 3:08 PM
Type: Talk Session: Galactic Science
Track: Galactic
Shocks of stellar winds and supernova remnants (SNRs) can accelerate particles to energies of 100 TeV or higher and are thus believed to be sources of Galactic cosmic rays. Multi-frequency studies of SNRs and superbubbles from radio to X-rays help to understand the propagation of shock waves and their interaction with the ambient medium, while combining the study of interstellar shocks w ... More
Presented by Manami SASAKI on 27 Aug 2018 at 2:30 PM
Type: Talk Session: Particle Physics
Track: Plenary
We discuss the current status of theoretical and experimental neutrino physics, focusing on ways in which neutrinos can help to answer some of the most fundamental questions in particle physics and astrophysics. Topics covered include neutrino oscillations, neutrino masses, neutrino astronomy, and connections between the neutrino sector and dark matter.
Presented by Joachim KOPP on 30 Aug 2018 at 10:00 AM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Baikal-GVD is a next generation, cubic-kilometer scale neutrino telescope which has been constructed since 2015 in the largest and deepest freshwater lake in the world, Lake Baikal. The detector itself is built from independent multi-megaton sub-arrays called clusters whose centers are 300 meters away. Every cluster consists of 8 strings each carrying 36 Optical Modules (OMs) vertically spaced by ... More
Presented by Lukáš FAJT on 30 Aug 2018 at 4:15 PM
Type: Talk Session: Cosmology
Track: Plenary
Follows soon.
Presented by Martina GERBINO on 31 Aug 2018 at 9:00 AM
Type: Talk Session: Extragalactic
Track: Plenary
Follows soon.
Presented by Markus AHLERS on 28 Aug 2018 at 11:30 AM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR07
We investigate non-thermal electron and nuclei energy losses within the remnant of the binary neutron star merger GW170817. We demonstrate that if the non-thermal emission originates from synchrotron radiation of a Fermi shock accelerated electron population, then the absence of a cooling break from radio to X-rays can be used to constrain the magnetic field in the remnant to the mG level. If th ... More
Presented by Mr. Xavier RODRIGUES on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The IceCube Neutrino Observatory at the South Pole detects Cherenkov light from charged particles produced in neutrino interactions. At the highest energies, the neutrino flux is of cosmic origin, but its astrophysical sources are yet unknown. A measurement of the flavor ratio on Earth can provide important constraints on sources and production mechanisms. In this talk we present the measurement o ... More
Presented by Juliana STACHURSKA on 27 Aug 2018 at 4:50 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Unphysical distance dependence in convex features of deabsorbed blazar spectra (upward breaks), reported in 2014, suggested incorrect model of absorption of E>100 GeV gamma rays due to e+e- pair production on the extragalactic background light (EBL). We present and interpret results of the new study aimed to constrain EBL in the same approach, making use of an updated clean source sample, new gamm ... More
Presented by Prof. Sergey TROITSKY on 29 Aug 2018 at 5:15 PM
Type: Talk Session: Galactic Science
Track: Galactic
The shock waves at supernova remnants (SNRs) are the prominent acceleration sites of Galactic cosmic rays. The diffusion of the accelerated particles around the SNR shock is assumed to be Bohm type, where the diffusion coefficient is proportional to the particle energy. The details, however, remain unrevealed. There is a method to diagnose the diffusion coefficient from the cutoff shape of the ... More
Presented by Naomi TSUJI on 29 Aug 2018 at 3:15 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Direct detection experiments that utilise xenon have proven to be most sensitive for heavy (>5 GeV) dark matter particles. In this talk, I'll explore signals that allow xenon experiments to probe the dark matter - nucleon cross section for dark matter particles down to ~100 MeV. These signals arise from electron or photon emission from the xenon atom after a collision with a light dark matter part ... More
Presented by Dr. Christopher MCCABE on 29 Aug 2018 at 4:30 PM
Type: Talk Session: Galactic Science
Track: Galactic
We present follow-up X-ray and gamma-ray observations of two unidentified Galactic HAWC sources, 2HWC J1928+177 and 2HWC J1953+294, with the NuSTAR and VERITAS observatories. VERITAS gamma-ray observations of 2HWC J1928+177 resulted in upper limits, while a follow-up NuSTAR X-ray observation detected a variable X-ray point source with a bright IR counterpart. The HAWC source could be powered by t ... More
Presented by Dr. Kaya MORI on 27 Aug 2018 at 3:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR17
TeV gamma-ray emission has been detected from non-blazar low luminosity active galactic nuclei (LLAGN), establishing them as potential cosmic-ray accelerators as well as sources of PeV neutrino emission. However, current observations cannot determine whether the TeV gamma rays come from the jet or from the black hole (BH) core region. In this work we consider numerical general relativitic MHD mode ... More
Presented by Rafael ALVES BATISTA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Since Galactic cosmic rays are observed in the PeV range, at least a few sources that accelerate particles to this energy (“PeVatrons”) should exist. A PeVatron is expected to have a hard, hadronic gamma-ray spectrum that extends to at least tens of TeV without any apparent spectral break or cutoff. High energy (> 100 TeV) gamma ray observations are therefore essential to the study of these c ... More
Presented by Mr. Chad BRISBOIS on 28 Aug 2018 at 5:05 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Astrophysical sources of high-energy radiation such as AGN and microquasars produce relativistic jets. Particle acceleration in jets is theoretically well-motivated, but direct evidence of acceleration in jets has not been observed above a few TeV. Using 33 months of data from HAWC, we present evidence for the production of gamma rays >10 TeV in the jets of SS 433, one of the most powerful microqu ... More
Presented by Mr. Chang Dong RHO on 28 Aug 2018 at 3:20 PM
Type: Talk Session: Galactic Science
Track: Gamma-rays
SNR G24.7+0.6 is a 9.5 kyrs radio and GeV gamma-ray supernova remnant (SNR) evolving in a dense medium. In the GeV regime, SNR G24.7+0.5 shows a hard spectral index which which if extended to very high energies should be easily detected by current Cherenkov telescopes. We observed the field of view of SNR G24.7+0.6 with the MAGIC telescopes. The region shows a complex environment, displaying diffe ... More
Presented by Emma DE ONA WILHELMI on 31 Aug 2018 at 3:30 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR24
We discuss the loop-level process of photon splitting to three photons in quantum electrodynamics (QED) with broken Lorentz invariance at high energies. Concetrating to the model of standard QED with additional positive quartic term in photon dispersion relation, we calculate the rate of the process of photon splitting below the threshold of three-level process of photon decay to electron-positro ... More
Presented by Dr. Petr SATUNIN on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR06
Recently AMS-02 has reported the energy spectra of secondary cosmic-rays Li, Be, B up to a few TeV, which seem to be hardened above ~200GV. We discuss the production, acceleration, and escape of secondary cosmic-ray nuclei that are produced via spallation of primary cosmic-ray nuclei, such as C, N, and O in a supernova remnant (SNR) shock. Taking into account the energy-dependent escape of cosmi ... More
Presented by Dr. Norita KAWANAKA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
In late 2016 and early 2017, the flat spectrum radio quasar CTA 102 (z=1.032) experienced an extraordinary phase of its existence. Starting in October 2016, over the course of two months the gamma-ray flux rose by a factor 50 and decreased again for 2 months to pre-flare levels. This long-term trend has been superposed by short, bright flares, which made CTA 102 one of the brightest gamma-ray sour ... More
Presented by Dr. Michael ZACHARIAS on 29 Aug 2018 at 4:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Using tens of telescopes and cutting-edge design, the Cherenkov Telescope Array (CTA) project will probe high and very high-energy gamma rays with two independent installations in both hemispheres. With 5-20 times more sensitivity, depending on the energy, than current instruments such as MAGIC, HESS and VERITAS, as well as improved energy and angular resolutions, CTA will be an outstanding instru ... More
Presented by Dr. Michele DORO on 30 Aug 2018 at 2:40 PM
Session: Opening
Presented by Dr. Walter WINTER, Christian STEGMANN on 27 Aug 2018 at 8:45 AM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory in the high mountains of Mexico was completed in March of 2015 and is now giving us a new view of the TeV sky. HAWC is 15 times more sensitive than the previous generation of wide-field EAS gamma-ray instruments and is able to detect the Crab nebula at 5σ with each daily transit. Unlike Imaging Atmospheric Cherenkov Telescopes (IACTs) ... More
Presented by Dr. Henrike FLEISCHHACK on 27 Aug 2018 at 5:20 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G08
Pulsars are among the most prominent gamma-ray sources observed by Fermi. Despite the wealth of observational information and considerable efforts of theorists we still do not know their exact emission mechanism(s). However, it is widely agreed upon than pulsar activity is intimately connected to the copious generation of electron-positron pairs in pulsar magnetosphere; a rapidly rotating iso ... More
Presented by Dr. Andrey TIMOKHIN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic-rays
Track: Plenary
We discuss the possibility that ultra-high energy cosmic rays (UHECR) may be accelerated by shocks in the lobes of radio galaxies. Acceleration at the termination shocks of jets is problematic because relativistic shocks are poor accelerators to high energy. We show that non-relativistic shocks with suitable Hillas parameters occur in plasma streams flowing out of the jet termination regions and ... More
Presented by Prof. Tony BELL on 28 Aug 2018 at 10:00 AM
Type: Talk Session: Cosmic-rays
Track: Plenary
Follows soon.
Presented by Lorenzo SIRONI on 30 Aug 2018 at 12:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Diffuse TeV emission has been observed by H.E.S.S. in the Galactic Center region, in addition to the GeV gamma rays observed by Fermi. We propose that a population of unresolved millisecond pulsars located around the Galactic Center, suggested as possible candidates for the diffuse Galactic Center excess observed by Fermi, accelerate cosmic rays up to very high energies, and are thus also responsi ... More
Presented by Ms. Claire GUÉPIN on 29 Aug 2018 at 4:35 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Recently, the IceCube Neutrino Observatory has alerted the astrophysical community about the detection of a very energetic neutrino event (called IceCube-170922A). Upon this alert, the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope reported enhanced gamma-ray emission from BL Lac object TXS 0506+05, compatible with the direction of IceCube-170922A. The fact that this ... More
Presented by Prof. Markus BOETTCHER on 27 Aug 2018 at 2:50 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N10
We investigate the radiative decay of the cosmic neutrino background, and its impact on the spectrum of the cosmic microwave background (CMB) that is known to be a nearly perfect black body. We derive {\it exact} formulae for the decay of a heavier neutrino into a lighter neutrino and a photon, $\nu_j \to \nu_i + \gamma$, and of absorption as its inverse, $\nu_i + \gamma \to \nu_j$, by ac ... More
Presented by Mr. Marnix REEMST, Mr. Dylan VAN ARNEMAN on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: GW and followup Board #: GW01
Phase transitions in the early universe can readily create an observable stochastic gravitational wave background. We show that such a background necessarily contains anisotropies analogous to those of the cosmic microwave background (CMB) of photons, and that these too may be within reach of proposed gravitational wave detectors. Correlations within the gravitational wave anisotropies and their c ... More
Presented by Dr. Geller MICHAEL on 28 Aug 2018 at 3:45 PM
Type: Talk Session: GW and followup
Track: Plenary
Follows soon.
Presented by Alessandra BUONANNO on 27 Aug 2018 at 9:30 AM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
As the IceCube has steadily collected data over the last several years, certain tensions have emerged between observations on one hand and fits obtained to these observations when assuming a single power-law diffuse astrophysical flux of neutrinos on the other; and between fits obtained using different kinds of datasets (HESE vs through-going muons). We analyse whether these tensions may be mitiga ... More
Presented by Dr. Atri BHATTACHARYA on 30 Aug 2018 at 5:10 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Due to the discrepancy between the observed and predicted average number of muons in air showers, the connection between the average muon content and the development of air showers has been studied extensively in the past. Here we present a study of the physics of the fluctuations of the muon content. In addition to proving that the fluctuations must be dominated by the first interactions, we show ... More
Presented by Felix RIEHN on 29 Aug 2018 at 2:15 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
The gravitational waves from a neutron star binary inspiral carry unique information about fundamental physics in extreme conditions. I will discuss the imprints of the properties of neutron star matter on the gravitational waves, what we have learned from the neutron star binary inspiral event GW170817, and outline future prospects and challenges.
Presented by Dr. Tanja HINDERER on 28 Aug 2018 at 6:05 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N06
Since the detection of high-energy cosmic neutrinos at the IceCube Neutrino Observatory in 2013, there has been an on-going search to find suitable transient or variable source candidates. Previous analyses testing Supernovae, GRBs and time-integrated Blazar emission have lead to constraints disfavouring these sources as dominant contributors to the observed neutrino flux. However, Tidal Disruptio ... More
Presented by Mr. Robert STEIN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
A precise knowledge of the local dark matter velocity distribution and its uncertainties is necessary for the correct interpretation of dark matter direct detection data. High resolution hydrodynamical simulations of galaxy formation provide important information on the properties of the dark matter halo, and find that baryons generally make the local dark matter velocity distribution of Milky Way ... More
Presented by Nassim BOZORGNIA on 28 Aug 2018 at 3:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Revealing the nature of dark matter is one of the most riveting open tasks of modern astronomy and cosmology. To this end, observing and analyzing high-energy gamma-rays provides a promising and highly-effective tool to constrain the properties of dark matter particles. Being currently in its pre-construction phase, the Cherenkov Telescope Array (CTA) will soon observe the high-energy gamma-ray s ... More
Presented by Mr. Christopher ECKNER on 30 Aug 2018 at 3:30 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The injection problem is a key and still unresolved issue of diffusive shock acceleration theory. Electron injection mechanisms at high Mach-number nonrelativistic perpendicular shocks are under consideration here for parameters that are applicable to young SNR shocks. Using high-resolution large-scale two-dimensional fully kinetic particle-in-cell (PIC) simulations we explore the production of hi ... More
Presented by Dr. Artem BOHDAN on 29 Aug 2018 at 4:49 PM
Type: Talk Session: Gamma Rays
Track: Plenary
Follows soon.
Presented by Avery BRODERICK on 29 Aug 2018 at 10:00 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
Cosmic rays are one important tool to study dark matter annihilation in our Galaxy. Recently, a possible hint for dark matter annihilation was found in the antiproton spectrum measured by AMS-02. The potential signal is affected by many theoretical and systematic uncertainties making its validation or exclusion a non-trivial task. The most direct but complementary way to test the dark matter inter ... More
Presented by Mr. Michael KORSMEIER on 30 Aug 2018 at 5:50 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Pulsars are among the most compact Very High Energy photon sources of the universe, but the physics processes behind their emission are not yet fully understood. MAGIC, a system of two Imaging Atmospheric Cherenkov Telescopes located at 2200 m a.s.l. on the Canary Island of La Palma (Spain), has pioneered the field of VHE pulsar physics and continues contributing to the advancement of our under ... More
Presented by Mr. Giovanni CERIBELLA on 30 Aug 2018 at 4:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
At the highest energies the cosmic neutrino flux drops rapidly and an even larger detection volume than the cubic kilometer of ice currently probed by the IceCube experiment is needed. Due to its long attenuation length, the radio signal provides the ideal means to cover such large volumes. Nevertheless, the direct radio emission from a neutrino induced particle cascade becomes detectable around E ... More
Presented by Dr. Krijn DE VRIES on 28 Aug 2018 at 5:35 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N12
We propose that the radiative generation of the neutrino mass can be achieved by incorporating the kinetic mixing of fermion fields which arises radiatively at 1 loop level. As a demonstrative example of the application of the mechanism, we will present the particular case of Standard Model extension by U(1)$_D$ symmetry. As a result, we show how neutrino masses can be generated via kinetic mixing ... More
Presented by Oleg POPOV on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Air showers can be detected by the short radio pulses they emit. The LOFAR radio telescope contains a dense core region where 384 antennas are located within a circle of 320 m diameter. Here, the properties of radio emission from air showers have been measured in unprecedented detail. The complicated radiation patterns on the ground have been shown to agree with modern theory, including the full S ... More
Presented by Stijn BUITINK on 27 Aug 2018 at 3:25 PM
Type: Talk Session: Neutrino Astronomy
Track: Plenary
Follows soon.
Presented by Anna NELLES on 27 Aug 2018 at 12:00 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Ultra-High Energy (UHE) neutrino (nu) detection via the Askaryan effect in Antarctic ice is a long-time goal of the field of astro-particle physics. The Askaryan effect occurs when a UHE cascade radiates electromagnetic waves. For UHE-nu interactions, the Askaryan signal is expected to be in the radio-frequency (RF) bandwidth, and Antartic ice is a suitable detection medium for such signals. Re ... More
Presented by Dr. Jordan HANSON
Type: Talk Session: Particle Physics
Track: Particle Physics
I will discuss the production of charm due to CR interactions in the atmosphere and the implications for astrophysical experiments. I will review both recent theoretical progress in QCD computations of prompt neutrino fluxes and recent developments and attempts of incorporating charm in hadronic interaction models traditionally used for studies of extended air showers.
Presented by Dr. Maria Vittoria GARZELLI on 29 Aug 2018 at 2:00 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The IceCube Neutrino Observatory studies a wide range of phenomena including neutrino astronomy, dark matter searches, neutrino oscillations, and cosmic ray physics using a cubic kilometer of instrumented ice at the South Pole. Recently, IceCube reported evidence for the first identified source of the high energy astrophysical neutrino flux. This represents a major milestone towards understanding ... More
Presented by Joshua WOOD on 27 Aug 2018 at 2:00 PM
Type: Talk Session: Extragalactic
Track: Plenary
Follows soon.
Presented by Jason HESSELS on 28 Aug 2018 at 12:00 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The discovery of a cosmic neutrinos diffuse flux by IceCube together with the recent observation of gravitational waves have widened our spectrum of probes needed for multi-messenger astronomy. However, the origin of the faint flux of high-energy astrophysical neutrinos is still unknown. The ANTARES neutrino telescope is currently the detector with the largest sensitivity located in the Northern h ... More
Presented by Dr. Simone BIAGI on 28 Aug 2018 at 4:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Plenary
Follows soon.
Presented by Darren GRANT on 27 Aug 2018 at 11:00 AM
Type: Talk Session: Highlights
Track: Plenary
Follows soon.
Presented by Karen YANG on 31 Aug 2018 at 11:30 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
Cherenkov telescopes such as HESS, VERITAS, and CTA, represent one of the most promising avenues to detect popular dark matter candidates like the wino, higgsino, and minimal dark matter. Yet theoretical predictions for the annihilation rate and spectrum of photons produced in such models is a notoriously difficult multi-scale problem, sensitive to the dark matter mass, electroweak scale, and also ... More
Presented by Mr. Nicholas RODD on 27 Aug 2018 at 3:30 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM08
Compact stellar objects such as neutron stars (NS) are ideal places for capturing dark matter (DM) particles. We study the effect of self-interacting DM (SIDM) captured by the nearby NS that can reheat NS to an appreciated surface temperature. Recently, DM self-interaction was considered as an negligible effect due to its small geometric cross section in NS. However, we will demonstrate when DM-nu ... More
Presented by Prof. Chian-Shu CHEN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Most fast radio bursts (FRB) do not show evidence of repetition, and such non-repeating FRBs may be produced at the time of a merger of binary neutron stars (BNS), provided that the BNS merger rate is close to the high end of the currently possible range. However, the merger environment is polluted by dynamical ejecta, which may prohibit the radio signal from propagating.We examine this by usi ... More
Presented by Mr. Shotaro YAMASAKI on 27 Aug 2018 at 5:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Located at the South Pole, the IceCube Neutrino Observatory is the world largest neutrino telescope, instrumenting one cubic kilometre of Antarctic ice at a depth between 1450m to 2450m. In 2013 IceCube reported the first observations of a diffuse astrophysical high-energy neutrino flux. Although the IceCube Collaboration has identified more than 100 high energy neutrino events, the origin of t ... More
Presented by Matthias HUBER on 28 Aug 2018 at 6:05 PM
Type: Talk Session: Galactic Science
Track: Galactic
I will review the current state of the art in available data and emission models of binary systems at high- (0.1-100GeV) and very-high-energy (>100GeV) gamma rays. The majority among these systems consists of an early type star with a strong stellar wind and a compact companion. Commonly accepted models assume that the compact object is a pulsar having a pulsar wind driven by the pulsar's spin-do ... More
Presented by Daniela HADASCH on 31 Aug 2018 at 2:30 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Cold dark matter candidates generically lead to the structuring of matter on scales much smaller than typical galaxies. This clustering translates into a very population of subhalos in galaxies, which induces an enhancement of the average annihilation rate with respect to a smooth-halo assumption. Recent work by van den Bosch et al. showed that the number of these objects that survive tidal intera ... More
Presented by Mr. Martin STREF on 27 Aug 2018 at 4:30 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Recent HAWC observations have found extended TeV emission coincident with the Geminga and Monogem pulsars. In this talk, I will show that these detections have significant implications for our understanding of the TeV gamma-ray sky. First, the spectrum and intensity of these TeV Halos indicates that a large fraction of the pulsar spindown energy is efficiently converted into electron-positron pair ... More
Presented by Dr. Tim LINDEN on 30 Aug 2018 at 5:23 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The galactic dwarf spheroidal (dSph) galaxies are the promising targets for the dark matter indirect searches for particle dark matter. To place robust constraints on candidate dark matter particles, understanding the dark matter distribution of these systems is of substantial importance. However, various non-negligible systematic uncertainties complicate the estimate of the J-factors relevant f ... More
Presented by Dr. Kohei HAYASHI on 27 Aug 2018 at 3:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N01
Measuring precise all-flavor neutrino information from a supernova is crucial for understanding the core-collapse process as well as neutrino properties. We apply a chi-squared analysis for different detector setups to explore determination of νe spectral parameters. Using a long-term two-dimensional core-collapse simulation with three time varying spectral parameters, we generate mock data to ex ... More
Presented by Dr. Ranjan LAHA on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR21
SENSE - Ultimate low light-level sensor development is a project funded by the EC Horizon 2020 as FET Open Coordination and Support Action (CSA). The aim of SENSE is to coordinate research and development efforts in academia and industry in low light-level (LLL) sensoring. Therefor we prepared a European R&D roadmap towards the ultimate LLL sensor and with the experts group the progress with r ... More
Presented by Katrin LINK on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Particle Physics Board #: PP01
SModelS is a tool designed to decompose Beyond Standard Model (BSM) theories with a Z2 symmetry and confront them to results from the LHC experiment. The code uses simplified models results to achieve the task in a model independent way. The existing version focuses on supersymmetry searches with missing energy (MET) final state and already includes a large variety of searches from ATLAS and CMS. ... More
Presented by Alicia WONGEL on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR11
Fabian Schüssler on behalf of the SGSO Alliance The Southern Gamma-ray Survey Observatory (SGSO) is a proposed next-generation extensive air shower detector located at a high-altitude site in the mountains of South America. SGSO will be sensitive to astrophysical gamma rays and cosmic rays in the energy range between 100 GeV and 100 TeV. Its science case is build on three main pillars: SGSO wi ... More
Presented by Dr. Fabian SCHUSSLER on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR04
- Thomas Huber for the IceCube-Gen2 Collaboration The IceCube Collaboration foresees to upgrade the present surface array (IceTop) with scintillation detectors. This array will be used to mitigate the impact of snow accumulation on the reconstruction of cosmic-ray showers detected by IceTop. In addition it will increase the veto capabilities for high energy astrophysical and cosmogenic neutr ... More
Presented by Mr. Thomas HUBER on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted by this encounter, 10 years of IceCube neutrino data were searched for additional, independent neutrino emission from the position of the blazar. Two methods were applied to search for an excess of neutrino events in the direction ... More
Presented by Dr. Imen AL SAMARAI on 27 Aug 2018 at 2:35 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR04
Carpet is an air-shower array at Baksan, Russia, equipped with a large-area muon detector, which makes it possible to separate primary photons from hadrons. We report first results of the search for primary photons with energies E>1 PeV, associated with IceCube neutrino flux, in the data obtained with Carpet-2 (175 square-meter muon detector). The installation was upgraded to Carpet-3 (410 square- ... More
Presented by Prof. Sergey TROITSKY on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Neutrinos
Cosmic rays were discovered a century ago, however the sources of the ultra-high-energy events remain unidentified. It is believed that the same environments that accelerate ultra-high-energy cosmic rays (UHECRs) also produce high-energy neutrinos via hadronic interactions. Two out of three joint analyses of the IceCube Neutrino Observatory, the Pierre Auger Observatory and the Telescope Array y ... More
Presented by Lisa SCHUMACHER on 31 Aug 2018 at 2:15 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR27
As gamma rays propagate from their sources of production to Earth, radiation-matter interactions can occur, leading to an effective screening of the incident flux. In the PeV-EeV range, the dominant energy loss mechanism for photons is the production of electron-positron pairs. These pairs can emit bremsstrahlung photons as they interact with local electromagnetic fields. These photons can initiat ... More
Presented by Mr. Kevin ALMEIDA CHEMINANT on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: GW and followup Board #: GW02
Gamma-ray bursts (GRBs) are one of the most captivating extragalactic astrophysical phenomena. These transient events have been widely proposed as bright sources of the most energetic cosmic rays and gravitational waves. With its wide field of view (~2 str) and >95% duty cycle, the High Altitude Water Cherenkov (HAWC) Observatory, installed at 4100 m a.s.l. in the state of Puebla (Mexico), is the ... More
Presented by Dr. Simone DICHIARA, Dr. Maria Magdalena GONZÁLEZ SÁNCHEZ, Dr. Nissim Illich FRAIJA CABRERA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Follows soon.
Presented by Caterina DOGLIONI on 30 Aug 2018 at 2:30 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Follows soon.
Presented by Todd ADAMS on 30 Aug 2018 at 2:45 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
Follows soon.
Presented by Saverio D’AURIA on 30 Aug 2018 at 3:00 PM
Type: Talk Session: Highlights
Track: Plenary
The IceCube neutrino observatory has not only discovered the existence of a cosmic neutrino component, but has also made precise measurements of the TeV atmospheric neutrino flux. Using these high-energy atmospheric neutrinos and the astrophysical neutrinos I will present results of searches for new neutrino flavors and interactions. On the former, I will report the status of searches for eV scale ... More
Presented by Dr. Carlos ARGÜELLES DELGADO on 31 Aug 2018 at 11:00 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
The Milky Way halo is the brightest source of dark matter annihilation on the sky. Indeed, the potential strength of the Galactic dark matter signal can supersede that expected from dwarf galaxies and galaxy groups even in regions away from the Inner Galaxy. We present the results of a search for dark matter annihilation in the smooth Milky Way halo for $|b| > 20^\circ$ and $r < 50^\circ$ using 41 ... More
Presented by Laura CHANG on 30 Aug 2018 at 3:15 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The IceCube neutrino observatory has detected a flux of extragalactic neutrinos. However, the origin of the neutrinos is still unknown. Among the possible candidates are Gamma-Ray Bursts (GRBs), Core-Collapse Supernovae (SNe), Active Galactic Nuclei (AGN) and Tidal Disruption Events (TDEs) - all are accompanied by a characteristic optical counterpart. Therefore, the goal is to identify the neutrin ... More
Presented by Dr. Ludwig RAUCH on 29 Aug 2018 at 2:55 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G04
Recent work has suggested that spatially extended TeV emission from pulsars (TeV Halos), such as that seen corresponding to Geminga, Monogem, and HAWC J0543+233 is distinct from Pulsar Wind Nebulae seen in X-ray energies. The primary difference between the two is one of particle transport; for a PWN leptons are confined near the pulsar due to interactions between the pulsar wind and the surroundin ... More
Presented by Mr. Chad BRISBOIS on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
ANITA (the ANtarctic Impulsive Transient Antenna) is a long-duration balloon borne radio interferometer designed to search for ultra-high energy (> 10^18 eV) cosmogenic neutrinos. Over a few weeks it flies at an altitude of 37km, scanning the Antarctic ice for Askaryan radio emission created by neutrino interactions. To date four science flights have been completed, with a fifth flight proposed ... More
Presented by Ben STRUTT on 28 Aug 2018 at 5:05 PM
Type: Talk Session: Cosmology
Track: Cosmology
In this talk, I would like to review how the CMB (in particular its temperature and polarization anisotropies) can be used to look for ultra light axion-like particles (ULAs). Such ULAs are numerous in the axiverse scenario and can play many role in cosmology, from Dark Matter to Dark Energy. Moreover, they have been invoked to solve several recent cosmological tensions. In particular, ULAs can ... More
Presented by Dr. Vivian POULIN on 30 Aug 2018 at 4:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
In the context of dark matter (DM) searches, it is crucial to quantify and reduce theoretical uncertainties affecting predictions of observables that depend on the DM velocity distribution, including event rates in direct searches, velocity-dependent annihilation rates, and microlensing event rates for DM compact objects. The well-known Eddington inversion formalism for the self-consistent reconst ... More
Presented by Dr. Thomas LACROIX on 29 Aug 2018 at 5:30 PM
Type: Talk Session: Cosmology
Track: Plenary
Self-interacting dark matter provides an interesting alternative dark matter candidate. In my talk I will motivate self-interacting dark matter models from an astrophysical perspective demonstrating their impact on structure formation on galactic scales. I will also discuss first attempts of simulating inelastic models of self-interacting dark matter and show how their impact on structure for ... More
Presented by Mark VOGELSBERGER on 31 Aug 2018 at 9:30 AM
Type: Talk Session: Dark Matter
Track: Dark Matter
The IceCube Neutrino Observatory at the South Pole is the world's largest neutrino telescope in operation. It instruments a kilometer cube of ice with more than 5000 optical sensors that detect the Cherenkov light emitted by particles produced in neutrino-nucleon interactions. Being sensitive to a wide range of neutrino energies, from a few GeV to PeVs, its physics program is extremely rich. Th ... More
Presented by Dr. Carlos DE LOS HEROS on 30 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR26
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe-class mission concept designed to operate at energies from $\sim$ 200 keV to > 10 GeV. Both Compton scattering and pair-production events must be considered in the AMEGO design since the interaction cross section has a crossover at $\sim$ 15 MeV. AMEGO is made of four major subsystems: a plastic anticoincidence detector for rejecti ... More
on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
LHAASO is a complex of air shower detector arrays under construction. With the detection of muons in air shower, the arrays have strong selection power of VEH-UHE gamma rays out of the CR background. Its wide FoV and continuous operation time will provide a survey sensitivity of 10 mini-Crab-unit over the whole northern sky and monitoring for transient phenomena, such as GRB HE-photons. The differ ... More
Presented by Zhen CAO on 31 Aug 2018 at 3:42 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Despite significant progress over more than 100 years, no cosmic ray accelerator has been unambiguously identified as the source of the locally measured flux. High-energy electrons and positrons are of particular relevance in the search for sources as radiative energy losses constrain their propagation to distances of about 1 kpc. At the highest energies, the measured spectrum is dominated and sha ... More
Presented by Philipp MERTSCH on 30 Aug 2018 at 2:00 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM20
The main strategy of dark matter (DM) direct searches is to look for nuclear recoils from DM particles scattering on the detector medium. Of all the existing DM direct detection experiments only the DAMA experiment claims to observe the characteristic annually oscillating DM signal with the right phase at the significance level of ~ 12 sigma. Since many other experiments using various methods and ... More
Presented by Maxim LALETIN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
A measurement of the Extragalactic Background Light (EBL) from a combined likelihood analysis of blazar spectra detected by the MAGIC Telescopes is presented. EBL is the optical-infrared diffuse background light accumulated during the history of the Universe, directly emitted (mostly) by stars or reprocessed by dust, providing unique information about the history of galaxy formation. The low energ ... More
Presented by Dr. Monica VAZQUEZ ACOSTA on 27 Aug 2018 at 4:35 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
High energy γ-ray photons emitted by astrophysical sources are absorbed by pair production with the diffuse extragalactic background light (EBL), which results in a decrease of the transparency of the universe to γ rays. Multiple extensions of the Standard Model predict the existence of axion-like particles (ALPs), a new type of pseudoscalar particles that can couple to photons in the presence o ... More
Presented by Mr. Galo GALLARDO ROMERO on 27 Aug 2018 at 5:00 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
In this talk, I would like to review how the CMB (in particular its temperature and polarization anisotropies) can be used to perform both direct and indirect detection of DM. Firstly, I will show the great complementarity between underground direct detection experiment and the CMB in looking for direct scattering between dark and baryonic matter. I will then discuss how the CMB challenges the ... More
Presented by Dr. Vivian POULIN on 31 Aug 2018 at 2:40 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM10
In some models for WIMP dark matter, radiative corrections dominate over the LO contributions in the computation of annihilation cross sections relevant for indirect detection. These corrections need to be resummed to all orders in perturbation theory for theoretical predictions to be sensible. In this talk I will employ -and briefly review- resummation methods that are traditionally used in ot ... More
Presented by Mr. Martin VOLLMANN on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
Ultra-luminous X-ray sources (ULXs) are extragalactic, off-nucleus, point-like X-ray sources with enormous luminosity $> 10^{39} ~[{\rm erg}~{\rm s}^{-1}]$, which exceeds the Eddington limit for stellar-mass black holes. Because of such a large luminosity, ULXs are expected to be powered by the super-Eddington accretion onto neutron stars or stellar-mass black holes, or sub-Eddington accretion ont ... More
Presented by Dr. Tomohisa KAWASHIMA on 27 Aug 2018 at 5:25 PM
Type: Talk Session: Galactic Science
Track: Galactic
The High Altitude Water Cherenkov (HAWC) gamma-ray observatory has been fully operational since March 2015 in central Mexico. Using $\sim$3 years of HAWC data and recently developed energy estimation techniques, now it is possible to study the highest energy sources with their energy-dependent morphology. The unidentified VER J2019+368 is among the highest energy sources and shows significant emi ... More
Presented by Mr. Vikas JOSHI on 31 Aug 2018 at 3:15 PM
Type: Talk Session: Extragalactic Science
Track: Extragalactic
The Universe is expected to be opaque for gamma rays with TeV energies. However several distant blazars have been observed in TeV region. One possible solution to this puzzle is to assume that the same sources emit cosmic rays towards the Earth and the gamma rays observed are products of line of sight cosmic ray interactions. We examine viability of this scenario in the context of possible cosmic ... More
Presented by Dr. Mikhail KUZNETSOV on 29 Aug 2018 at 5:30 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR01
The Uhecr anisotropy at tens EeV and at 60 EeV found by Auger maps overlap partially with the observed TeV anisotropy found by Argo and Hawc array detectors lastt decade. We had proposed it since many years. These combined signals offer a reading key to identify the Uhecr source names, their address and their secondary fragment tails.
Presented by Dr. Daniele FARGION on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
In this contribution, the search of high-energy gamma ray emission as electromagnetic counterpart of the binary neutron star merger GW170817 with the H.E.S.S. Imaging Air Cherenkov Telescopes is presented. Observations started 5.3 h after the merger and contained the counterpart SSS17a that was identified several hours later. It stands as the first data obtained by a ground-based pointing instrume ... More
Presented by Mrs. Monica SEGLAR ARROYO on 30 Aug 2018 at 5:55 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Galactic Board #: G06
Supersonic and collimated bipolar jets are launched from the inner regions of accretion discs in forming stars. Jets from young stellar objects are well known thermal emitters. However, non-thermal radio emission from a handful of protostellar jets has been reported in the last years. The detection of synchrotron radiation indicates the presence of relativistic electrons and magnetic field ... More
Presented by Dr. Anabella ARAUDO on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Extragalactic Board #: EG02
Blazars spectral energy distributions are dominated by non-thermal emission from the jet, consisting of two main bumps. For the so-called extreme blazars, these components each peak in the X-ray and GeV-TeV bands. Recent TeV observations have revealed a few of these objects whose second peak exceeds several TeV (e.g. 1ES 0229+200). Such intriguing sources have been objects of different studies re ... More
Presented by Dr. Luca FOFFANO on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Telescope Array (TA) is a cosmic ray detector in the Northern hemisphere that measures cosmic rays of energies from 1 PeV to 100 EeV and higher. TA is a hybrid detector that consists of a ground array of scintillation counters, covering 700 km$^2$ on the ground, and overlooked by the three fluorescence detector stations. Sensitivity of TA has been extended by the TA low energy extension (TALE) t ... More
Presented by Dr. Dmitri IVANOV on 28 Aug 2018 at 2:15 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Telescope Array observes ultra-high-energy cosmic rays in the Northern hemisphere for 10 years, and the statistics starts to allow for studies of the cosmic-ray flux not only averaged over the field of view, but direction-dependent. I review recent Telescope Array results and future plans related to anisotropy of arrival directions and direction-dependent studies of the energy spectrum and primary ... More
Presented by Prof. Sergey TROITSKY on 28 Aug 2018 at 2:30 PM
Type: Poster (A0 portrait) Session: Dark Matter
Track: Dark Matter
Test
Presented by Mr. Maximilian DREYER
Type: Talk Session: Dark Matter
Track: Dark Matter
In the framework of zoom-in cosmological simulations published in Mollitor et al 2015, together with news runs, we compare the phase-space distributions of simulations of Milky Way like Halos with those inferred by the Eddington inversion. This method as presented by Lacroix et al 2018 is able to deduce the phase-space distribution of Dark Matter (DM) at different radii from the mass density d ... More
Presented by Mr. Arturo NUNEZ-CASTINEYRA on 30 Aug 2018 at 4:20 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The gamma-ray emission in broad-line blazars is generally explained as inverse Compton (IC) radiation of relativistic electrons in the jet scattering optical-UV photons from the broad-line region (BLR), the so-called BLR external Compton (EC) scenario. We test this scenario on the Fermi gamma-ray spectra of 106 broad-line blazars detected with the highest significance or largest BLR, by looking fo ... More
Presented by Dr. Sara CUTINI on 29 Aug 2018 at 2:15 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The CALorimetric Electron Telescope (CALET) space experiment, which has been developed by Japan in collaboration with Italy and the United States, is a high-energy astroparticle physics mission installed on the International Space Station (ISS). The primary goals of the CALET mission include investigating possible nearby sources of high-energy electrons, studying the details of galactic particle p ... More
Presented by Yoichi ASAOKA on 27 Aug 2018 at 2:51 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Eta Car is a colliding-wind binary composed of a massive luminous blue variable (~100 solar masses) and a companion star of O or B-type (~ 30 solar masses). Its orbit is very eccentric and has a period of 2023 days. Although the binary has a rich observational history in, e.g. the optical regime, strong experimental evidence for gamma-ray emission from the system has built up only recently. It is ... More
Presented by Eva LESER on 28 Aug 2018 at 2:35 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Recent analyses of the gamma-ray flux from Arp 220 have shown that the observed gamma-ray flux is larger than can be accounted for by the measured star formation rate. In contrast, the radio spectra observed for the galaxy's two nuclei are consisted with the observed rate. This indicates an excess of cosmic rays or additional cosmic ray population which produces more gamma-ray emission but not m ... More
Presented by Tova YOAST-HULL on 28 Aug 2018 at 6:05 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Crab nebula is a bright emitter of non-thermal radiation across the entire accessible range of wavelengths. The spatial and spectral structures of the synchrotron nebula are well-resolved from radio to hard X-ray emission. The un-pulsed emission at GeV to TeV energies is mostly produced via inverse-Compton scattering of energetic electrons with the synchrotron-emitted photons. The spatial str ... More
Presented by Mr. Paul Kin-Hang YEUNG on 30 Aug 2018 at 4:32 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
A persistent excess of gamma rays measured with the Fermi-LAT has been found towards the center of the Galaxy, typically referred to as the Galactic Center Excess (GCE). While its existence is well established, its nature and origin are still debated. While a simple but exotic origin for the GCE could be the annihilation of dark matter, other astrophysical origins, such as emission from millisecon ... More
Presented by Emma STORM on 29 Aug 2018 at 4:50 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Fermi bubbles (FBs) are two giant gamma-ray lobes above and below the Galactic center. Their origin is not clear yet and both hadronic and leptonic models are currently allowed. In the hadronic model, the acceleration of protons and/or nuclei and their subsequent interactions with gas in the bubble volume can produce the observed gamma rays and high-energy neutrinos as counterparts. The detect ... More
Presented by Ms. Lili YANG, Prof. Soebur RAZZAQUE on 29 Aug 2018 at 5:20 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Previous analyses of point sources in the gamma-ray range were done only below 30 MeV (COMPTEL) or above 100 MeV (Fermi-Large Area Telescope). Below 30 MeV, the imaging Compton telescope (COMPTEL) detected 26 steady sources in the energy range from 0.75 to 30 MeV. At high energy, the LAT detects more than three thousand sources between 100 MeV and 300 GeV (3FGL). Since the Fermi-LAT detects gamma ... More
Presented by Mr. Giacomo PRINCIPE on 29 Aug 2018 at 2:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Galactic Center (GC) hosts a Super-Massive Black Hole (SMBH) of 4*10^6 Msun, Sgr A*, which has apparently experienced phases of quasar activity in the past and might accelerate particles up to very high energy. The inner 150 pc also harbor intense star formation activity and many Supernova Remnants and Pulsar Wind Nebulae which must also be the site of sustained particle acceleration. At GeV ... More
Presented by Dr. ANNE LEMIERE on 29 Aug 2018 at 4:15 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Multi-TeV cosmic-ray electrons carry unique information about local accelerators because of their severe radiative energy losses and the associated short propagation distances. The very low fluxes and the large background of hadronic cosmic rays however impose severe challenges to both space-born and ground-based measurements. The next generation satellite experiments are just starting to probe th ... More
Presented by Dr. Daniel KERSZBERG on 30 Aug 2018 at 2:34 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Neutrinos Board #: N05
IceCube analyses which look for an astrophysical neutrino signal in the southern sky face a large background of atmospheric muons and neutrinos created in cosmic ray air showers. Selecting for events which start inside the detector suppresses not only the downgoing muon background, but also the southern sky atmospheric neutrino background by the energy- and declination-dependent atmospheric self-v ... More
Presented by Sarah MANCINA on 28 Aug 2018 at 3:45 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM16
The standard way to calculate the thermal relic abundance of dark matter relies on the assumption that the dark matter particles remain in kinetic equilibrium throughout the chemical freeze-out process. However, this assumption is not always justified. This talk aims to address how to handle such situations, i.e. when an early kinetic decoupling happens, and discuss the phenomenological consequenc ... More
Presented by Dr. Michael GUSTAFSSON on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
In the past 15 years the H.E.S.S. collaboration has intensively surveyed the inner region of our own galaxy, the Milky Way. These observations have culminated in a recent release of 14 publications in a dedicated issue of Astronomy & Astrophysics. In this talk we will present the core part of this programme, the H.E.S.S. Galactic Plane Survey (HGPS), which yielded a catalog of 78 gamma-ray sou ... More
Presented by David BERGE on 30 Aug 2018 at 5:06 PM
Type: Talk Session: Galactic Science
Track: Galactic
Supernova remnant (SNR) N132D, located in the Large Magellanic Cloud, represents a unique opportunity for the study of gamma-ray emission from shock-accelerated cosmic rays (CRs) in another galaxy since it stands as the first and only extra-galactic SNR detected in gamma-rays. N132D is one of the brightest SNRs in the local Universe in the X-ray, infrared and radio bands, and it has also been dete ... More
Presented by Dr. Daniel CASTRO on 29 Aug 2018 at 3:30 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Despite intense inquiry, the sources at the origin of the high-energy neutrinos revealed by IceCube are still unknown. The potential correlation of an IceCube event with a flaring gamma-ray source has recently focused the attention on BL Lac objects, active galactic nuclei with a relativistic jet pointing to the Earth. Since the nuclei of these sources lack bright thermal components, it is ge ... More
Presented by Fabrizio TAVECCHIO on 29 Aug 2018 at 2:20 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
I will review the arguments in favor of either pulsars or annihilating dark matter as the source of the GeV excess observed from the Inner Galaxy. While it is not clear at this time which of these interpretations is correct, I will argue that upcoming observations will likely clarify the situation considerably.
Presented by Prof. Dan HOOPER on 31 Aug 2018 at 3:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The Tunka Advanced Instrument for cosmic ray and Gamma ray Astrophysics, TAIGA, aims at accessing the gamma-ray sky in the multi-TeV to PeV energy regime. This energy range is key to spectroscopically resolving the cutoff regime of the - yet to be identified - Galactic cosmic ray Pevatrons. Sensitive gamma-ray observations in this energy range are essential for this task, and require a very large ... More
Presented by Martin TLUCZYKONT on 31 Aug 2018 at 3:25 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Fabian Schüssler for the CTA consortium The Cherenkov Telescope Array (CTA) is the next generation high-energy gamma-ray observatory using the Imaging Air Cherenkov Telescope (IACT) technique. It will improve the sensitivity level of current instruments by an order of magnitude, provide energy coverage for photons from 20 GeV to at least 300 TeV to reach to high redshifts and extreme accelerat ... More
Presented by Dr. Fabian SCHUSSLER on 27 Aug 2018 at 5:35 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
VERITAS is an imaging atmospheric Cherenkov observatory that is sensitive to gamma rays in the energy range between 85 GeV and > 30 TeV. VERITAS observations allow for the study of a wide variety of physics, including energetic environments inside and outside our galaxy, searches for dark matter, and a number of topics in astroparticle physics. We present an update on indirect dark matter searches ... More
Presented by Mr. Nathan KELLEY-HOSKINS on 27 Aug 2018 at 2:20 PM
Type: Talk Session: Neutrino Astronomy
Track: Extragalactic
In September 2017, the IceCube neutrino observatory revealed an event designated IceCube-170922A with a high probability of being of astrophysical origin. The event was detected in spatial coincidence with the BL Lac object TXS 0506+056 during a period of enhanced GeV gamma-ray activity. We monitored the object in the very-high-energy (VHE; E>100 GeV) band with the MAGIC telescopes, clearly dete ... More
Presented by Elisa BERNARDINI on 27 Aug 2018 at 5:05 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Very high-energy gamma-rays from TeV blazars interact with the extragalactic background light producing pair beams. These pairs emit secondary photons in the GeV range by the inverse Compton scattering. However, the measured GeV signal is smaller compared to one predicted from the full electromagnetic cascade. From what follows that the pairs are affected by some other physical processes leading t ... More
Presented by Dr. Sergei VAFIN on 29 Aug 2018 at 3:30 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Large High Altitude Air Shower Observation (LHAASO), located in Daocheng Haizishan, 4300m a.s.l., Sichuan Province, Chain, is under construction now and is expected to be completely operated by 2021. One of the main science objects of LHAASO is to precisely measure the cosmic rays energy spectrum of individual components from 1014 eV to 1018 eV. LHAASO is consist of four types of detectors: the Wa ... More
Presented by Dr. Li.Qiao YIN on 27 Aug 2018 at 2:17 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Cosmic Rays Board #: CR03
Experimental complex NEVOD for investigations of cosmic rays in the energy interval (10^15-10^19 eV) is described. The composition of primary cosmic rays in the high energy region becomes heavier and interactions of these cosmic rays are nucleus-nucleus. The complex consists of Cherenkov water detector with 2000 m^3 volume, coordinate-tracking detector DECOR with 70 m^2 area, array of scintillato ... More
Presented by Dr. Egor ZADEBA on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Galactic Science
Track: Galactic
Using archival data from the Fermi Large Area Telescope in the 0.1 - 300$\,$GeV photon energy range, we detect and characterise the gamma-ray emission counterpart on parsec scales to the optically translucent, infrared-emitting and dominantly neutral "Cirrus" clouds, which carry the bulk of gas mass in the disk of the Milky Way at the solar circle. The detection is achieved using a stacking a ... More
Presented by Dr. Richard TUFFS on 29 Aug 2018 at 2:45 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
Following a Neutron star merger a jet propagates and interacts with the out owing ejecta that surrounds the merger. As a result matter is pushed around the jet to form a hot cocoon which applies pressure on the jet and potentially collimates it. The cocoon envelops the jet as long as the jet propagates within the dense ejecta. After the jet breaks out, the cocoon expands and emits radiation over ... More
Presented by Mr. Ore GOTTLIEB on 28 Aug 2018 at 5:05 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
Recent gravitational wave (GW) detections with LIGO/Virgo opened a new window on the Universe, unveiling the most violent catastrophic events in the cosmos. GW astronomy is just in its infancy, the Laser Interferometer Space Antenna (LISA) and Pulsar Timing Arrays (PTAs) will offer a complementary view of the GW universe in a much more extended range of frequencies, from mHz down to nHz. I will di ... More
Presented by Dr. Alberto SESANA on 28 Aug 2018 at 6:25 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
Recent analyses of the diffuse TeV-PeV neutrino flux highlight a tension between different IceCube data samples that strongly suggests a two-component scenario rather than a single steep power-law. In this talk, I show how such a tension is further strengthened once the latest ANTARES (9-year) and IceCube (6-year) data are combined together. Remarkably, both experiments show an excess in the same ... More
Presented by Dr. Marco CHIANESE on 31 Aug 2018 at 3:15 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
I will discuss recent results on gamma-ray observations of the Sun with Fermi, which revealed many interesting and surprising features. These gamma rays are expected to be produced by hadronic interactions between cosmic rays and the solar atmosphere. The high flux of gamma rays observed from the Sun requires a large boost of gamma-ray production by some mechanism, which is likely related to sola ... More
Presented by Dr. Ng KENNY CHUN YU on 28 Aug 2018 at 2:20 PM
Type: Talk Session: Gravitational Waves
Track: GW and followup
The current generation of gravitational-wave detectors have provided a wealth of information from coalescences of binary black holes and binary neutron stars. However, even at design sensitivity these detectors are only able to observe coalescences from the local universe, out to redshifts of a few. In contrast, the next generation of longer and more sensitive gravitational-wave detectors, such as ... More
Presented by Evan HALL on 30 Aug 2018 at 5:15 PM
Type: Talk Session: Galactic Science
Track: Galactic
The H.E.S.S. Galactic Plane Survey (HGPS) provides the most comprehensive view to date of the inner Milky Way in TeV gamma-rays. Of the sources detected, 40% can be firmly identified, mostly as pulsar wind nebulae (PWNe) or supernova remnants (SNRs). The uniform analysis of the HGPS allows systematic studies of the populations of these two classes of TeV-emitting objects. The population of ... More
Presented by Dr. Yves GALLANT on 27 Aug 2018 at 3:00 PM
Type: Talk Session: Particle Physics
Track: Particle Physics
The GERDA experiment searches for neutrinoless double beta decay of $^{76}$Ge. A discovery of this hypothetical decay would imply the Majorana nature of neutrinos and violation of lepton number conservation. To find this decay, with a half-life beyond 10$^{25}$ yr, gamma-ray spectrometers made from enriched $^{76}$Ge are operated directly immersed in liquid argon. Instrumenting the argon-filled ... More
Presented by Dr. Roman HILLER on 30 Aug 2018 at 3:15 PM
Type: Talk Session: Galactic Science
Track: Galactic
During the last two decades due to the increase of computing power and software developments, such as adaptive mesh refinement, substantial progress has been made in numerical modeling of the interstellar medium (ISM). It has been found that the bulk of kinetic and thermal energy input stems from supernovae and to a lesser extent from stellar winds. Our group has shown that on mesoscales (1 kpc x ... More
Presented by Dieter BREITSCHWERDT on 29 Aug 2018 at 2:00 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
High-energy gamma rays of interstellar origin are produced by the interaction of cosmic-ray (CR) particles with the diffuse gas and radiation fields in the Galaxy. The main features of this emission are well-understood and are reproduced by existing CR propagation models employing 2D Galactocentric cylindrically symmetrical geometry. However, the high-quality data from instruments like the Fermi L ... More
Presented by Dr. Troy PORTER on 28 Aug 2018 at 5:20 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The origin of ultra-high energy cosmic rays (UHECRs) is still one of the biggest unsolved questions in astrophysics. We present a novel approach combining the knowledge about neutrinos and cosmic rays at the highest energies to give an alternative, joint solution to this question with Tidal Disruption Events (TDEs). TDEs are processes where stars are torn apart by the strong gravitational force cl ... More
Presented by Daniel BIEHL on 28 Aug 2018 at 5:53 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Non-linear diffusive shock acceleration (NDSA) is believed to be the mechanism responsible for the acceleration of cosmic-rays in supernova remnants. But current steady-state models fail to reproduce spectral features observed in supernova remnants, like spectral breaks or soft spectra at the highest energies. We present a fully time-dependent NDSA-model in which we simultaneously solve the tra ... More
Presented by Robert BROSE on 29 Aug 2018 at 4:32 PM
Type: Talk Session: Cosmic-rays
Track: Plenary
The violent Universe still defies us, as the sources of ultra-high-energy cosmic rays remain unknown. Yet we have drastically increased the amount of information at very high energies in the last 5 years, with combined observations of cosmic rays, gamma rays, neutrinos, and gravitational waves. We will identify in this talk the multi-messenger data that can be relevant to solve this long-standing ... More
Presented by Dr. Kumiko KOTERA on 28 Aug 2018 at 9:30 AM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Emission of distant (redshift z>0.1) extragalactic sources in the GeV-TeV energy range may be significantly transformed during the propagation between the source and the observer. So far, the only robust result in this area was the firm establishment of the existence of the \gamma\gamma\rightarrow e^{+}e^{-} pair production process. During the last 8 years, there were many other claims that were u ... More
Presented by Timur DZHATDOEV on 31 Aug 2018 at 2:34 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. By defining a common open format for high-level gamma-ray data (containing event lists and instrument response functions, using the FITS standard) we allow multi-instrument analysis within the context of open-source software. This project ... More
Presented by Mr. Cosimo NIGRO on 27 Aug 2018 at 5:05 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Extragalactic Board #: EG04
We study the effects of interaction of jets in Active Galactic Nuclei when they encounter stellar clusters passing across the inner jet. The interaction provides a scenario to address non–thermal processes. In jet–star interactions a double bow–shock structure is formed where particles get accelerated via diffusive mechanism. Individual encounters have a limited effect, however, dense ... More
Presented by Dr. Anabella ARAUDO on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Cosmic-rays
Track: Plenary
Follows soon.
Presented by Carola DOBRIGKEIT on 28 Aug 2018 at 9:00 AM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Charged particles of extraterrestial origin with energies in excess of 10<sup>18</sup>&nbsp;eV (known as ultra-high-energy cosmic rays, UHECR) were first observed in the 1960s, and current-generation UHECR detectors have collected over 10<sup>5</sup> such events. Nevertheless, the interpretation of these data is not straightforward, and the sources of such particles are still unknown (but widely ... More
Presented by Dr. Armando DI MATTEO on 28 Aug 2018 at 5:02 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
In addition to the emergence of time domain astronomy, the advent of multi-messenger astronomy opens up a new window on transient high-energy sources. Through the multi-messenger study of the most energetic objects in our universe, two fundamental questions can be addressed: what are the sources of ultra-high energy cosmic rays (UHECRs) and the sources of very-high energy neutrinos? Jetted Tida ... More
Presented by Ms. Claire GUÉPIN on 28 Aug 2018 at 5:36 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
Radio galaxies are intensively discussed as the sources of cosmic rays observed above about 3 EeV, called ultra-high energy cosmic rays (UHECRs). The talk presents a first, systematic study that takes the individual characteristics of these sources into account, as well as the impact of the galactic magnetic field, as well as the extragalactic magnetic-field structures up to a distance of 120 Mpc ... More
Presented by Dr. Björn EICHMANN on 28 Aug 2018 at 6:10 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Neutrinos
In the context of the recent multi-messenger observation of neutron-star merger GW170817, we examine whether such objects could be sources of ultrahigh energy cosmic rays. At first order, the energetics and the population number is promising to envisage the production of a copious amount of particles, during the first minutes to weeks from the merger. On the other hand, the strong radiative enviro ... More
Presented by Mr. Valentin DECOENE on 31 Aug 2018 at 3:15 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
We perform a search of Dark Matter (DM) subhalo candidates among unassociated catalogued sources present in the most recent Fermi-LAT point-source catalogs (3FGL, 2FHL and 3FHL). These LCDM-predicted DM subhalos are promising candidates for gamma-ray emission from WIMP annihilation in the LAT energy band. Several selection criteria are applied, based on the expected properties of the DM-induced em ... More
Presented by Mr. Javier CORONADO-BLÁZQUEZ on 30 Aug 2018 at 3:00 PM
Type: Talk Session: Cosmic Rays
Track: Cosmic Rays
The origin of very high energy (VHE) cosmic rays is one of the oldest and deepest puzzles of astrophysics. Understanding particle production and acceleration in astrophysical sources, and the mechanisms of propagation of cosmic rays through the interstellar medium is paramount to solving this fundamental problem. Cosmic rays produced in nearby accelerators can be observed directly through measurem ... More
Presented by Mr. Andrii PETRASHYK on 27 Aug 2018 at 2:34 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
Because of their brightness and proximity (z=0.03), Mrk421 and Mrk501 are among the very-high-energy gamma-ray objects that can be studied with the greatest level of detail. This makes them excellent astrophysical high-energy physics laboratories to study the nature of blazars. Since 2009, there has been an unprecedentedly long and dense monitoring of the radio to very-high-energy gamma-ray emiss ... More
Presented by David PANEQUE on 29 Aug 2018 at 2:30 PM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
The origin of the astrophysical neutrinos detected by IceCube, whose energies extend up to a few PeV, is still unknown. In this work we investigate blazars (a class of relativistic jets from the core of active galaxies) as sources of the diffuse astrophysical neutrino flux. For a blazar of a given luminosity, we calculate the emitted neutrino spectrum using a recently developed numeric radiation ... More
Presented by Mr. Xavier RODRIGUES on 27 Aug 2018 at 5:20 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
The EDELWEISS collaboration is performing a direct search for WIMP dark matter in the mass range from 1 to 20 GeV/c2 using cryogenic germanium detectors equipped with a full charge and thermal signal readout. We present the most recent results and the currently ongoing program to reduce the experimental thresholds in order to gain sensitivity for low mass WIMPs. This comprises utilizing the Negano ... More
Presented by Dr. Klaus EITEL on 29 Aug 2018 at 4:15 PM
Type: Talk Session: Neutrino + Cosmic Rays
Track: Cosmic Rays
When ultra-high-energy cosmic rays (UHECRs) travel through the universe they create cosmogenic neutrinos via several interactions. The expected flux at Earth of these cosmogenic neutrinos generally depends on multiple parameters describing the sources and propagation of UHECRs. However, at a neutrino energy of ~1 EeV a 'sweet spot' occurs where this flux only depends strongly on two parameters, th ... More
Presented by Dr. Arjen VAN VLIET on 31 Aug 2018 at 2:30 PM
Type: Talk Session: Neutrino Astronomy
Track: Plenary
Follows soon.
Presented by Konstancja SATALECKA on 27 Aug 2018 at 11:45 AM
Type: Talk Session: Neutrino Astronomy
Track: Neutrinos
Massive stars with strong stellar winds are expected to be progenitors of the long gamma-ray burtsts (GRBs). The winds of these stars are expected to form a wind cavities within the dense clusters. We consider a scenario in which protons, accelerated within the jet of GRB, escape from the GRB jet to the wind cavity. They are transported with the massive star wind to the dense open cluster where t ... More
Presented by Prof. Wlodek BEDNAREK on 28 Aug 2018 at 5:50 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Dark Matter Board #: DM14
The supersymmetric WIMP hypothesis is currently under scrutiny as there is no experimental result supporting the existence a lightest supersymmetric particle. The recent non-detection in large scale direct detection experiments has demonstrated that a broader approach towards dark matter particles is indicated. In this work, we show a simple approach to convert constraints/sensitivities from ... More
Presented by Mr. Chao ZHANG on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Gamma Rays
Track: Gamma-rays
The spectrum of UHECR signal events above 55 EeV from Centaurus A (Cen A) can provide a useful hint about the injected spectrum of cosmic ray nuclei. The injected spectrum connects UHECRs to the HESS detected GeV-TeV gamma rays. The 8 years of Fermi-LAT data from Cen A has significant hardening in the GeV energy. In an attempt to understand the origin of this hardening, we explore two emitting zon ... More
Presented by Dr. Jagdish JOSHI on 29 Aug 2018 at 3:15 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
We take advantage of spacecraft Voyager 1's capacity for detecting interstellar CRs since it crossed the heliopause in 2012. This opens up a new avenue to probe DM through CR electrons and positrons in the sub-GeV energy range. From a complete description of the transport of electrons and positrons at low energy, we derive predictions for both the secondary astrophysical background and the pair pr ... More
Presented by Mr. Mathieu BOUDAUD on 29 Aug 2018 at 12:15 PM
Session: Wrap-up
Presented by Markus ACKERMANN, Gianfranco BERTONE on 31 Aug 2018 at 12:30 PM
Type: Poster (A0 portrait) Session: Poster Session and Coffee Break
Track: Gamma-rays Board #: GR15
The HAWC gamma ray observatory is located at the Sierra Negra Volcano in Puebla, Mexico, at an altitude of 4,100 meters. HAWC is a wide field of view array of 300 water Cherenkov detectors that are continuously surveying ~ 2sr of the sky, operating since March 2015. The large collected data sample allows HAWC to perform an unbiased monitoring of blazars. One of the closest and brightest blazar i ... More
Presented by Dr. Jose Andres GARCIA-GONZALEZ on 28 Aug 2018 at 3:45 PM
Type: Talk Session: Dark Matter
Track: Dark Matter
I will demonstrate how current and future measurements of the global 21-cm signal could provide new constraints on models of p-wave annihilating dark matter (DM), over a broad range of DM masses. 21-cm observations are sensitive to the baryon temperature at the end of the cosmic dark ages, and are particularly well-suited to constrain p-wave models, because the energy injection rate from p-wave an ... More
Presented by Gregory RIDGWAY on 31 Aug 2018 at 3:30 PM
tbc
Session: Gamma Rays