Joshua Cardenzana
(Institut de Recherche en Astrophysique et Planétologie)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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,...
Mr
said TALBAOUI
(Laboratory of Materials Physics)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Henrike Fleischhack Fleischhack
(Michigan Tech)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Mr
Nathan Kelley-Hoskins
(DESY)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Mr
Vikas Joshi
(Max-Planck-Institut für Kernphysik)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Andrea Turcati
(Technical University Munich)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Mr
Joseph Lundeen
(Los Alamos National Laboratory)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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. ...
Mr
Thomas Kintscher
(DESY)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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,...
28/08/2018, 15:45
GW and followup
Poster (A0 portrait)
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...
Leonel Morejon
(DESY)
28/08/2018, 15:45
Particle Physics
Poster (A0 portrait)
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,...
Jean-François Glicenstein
(IRFU, CEA-Saclay)
28/08/2018, 15:45
Particle Physics
Poster (A0 portrait)
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...
Dr
Nelson Videla
(Pontifical Catholic University of Valparaíso)
28/08/2018, 15:45
Cosmology
Poster (A0 portrait)
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...
Dr
Bradley Kavanagh
(GRAPPA, University of Amsterdam)
28/08/2018, 15:45
GW and followup
Poster (A0 portrait)
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....
Mr
Joshua Foster
(University of Michigan)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Joshua Eby
(Weizmann Institute of Science)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Mrs
Sabina Pürckhauer
(Max-Planck Institut für Kernphysik)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Prof.
Diego Restrepo
(Professor)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Ms
Niki Klop
(GRAPPA institute, University of Amsterdam)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Mr
Andrii Petrashyk
(Columbia University)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Ekrem Oguzhan Angüner
(CPPM)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Mr
Yoann GÉNOLINI
(Univ. of Brussels (ULB))
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Prof.
A. MURAT GULER
(Middle East Technical University)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Mr
Cédric Perennes
(LPNHE - Paris)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Mirko Bunse
(TU Dortmund)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Ankur Sharma
(INFN Pisa)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Dr
Giorgio Galanti
(INAF, Osservatorio Astronomico di Brera)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Prof.
Don Ellison
(North Carolina State University)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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...
Antonia Hubbard
(Northwestern University)
28/08/2018, 15:45
Particle Physics
Poster (A0 portrait)
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...
Ms
Armelle Jardin-Blicq
(Max Planck Instiute für Kernphysik)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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...
Mr
Giacomo D'Amico
(University of Rome "La Sapienza")
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Dr
Henrike Fleischhack Fleischhack
(Michigan Tech)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Prof.
Wlodek Bednarek
(University of Lodz)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Denis Bernard
(LLR, CNRS/IN2P3)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Mauricio Bustamante
(Niels Bohr Institute)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Ms
Ruiz-Velasco Edna
(Max-Planck-Institut für Kernphysik)
28/08/2018, 15:45
Extragalactic
Poster (A0 portrait)
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...
Jean-François Glicenstein
(IRFU, CEA-Saclay)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Michael Zacharias
(TPIV, Ruhr-Univseristät, Bochum, Germany)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Fabian Schussler
(CEA-Saclay)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Dimitrios Kantzas
(UvA/API/GRAPPA)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Prof.
Wlodek Bednarek
(The University of Lodz)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mrs
Iryna Lypova
(DESY, Zeuthen)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Christian Haack
(RWTH Aachen University)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Mr
Cédric Perennes
(LPNHE - Paris)
28/08/2018, 15:45
Extragalactic
Poster (A0 portrait)
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...
Dr
Nissim Fraija
(Astronomy Institute)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mrs
Ludmilla Dirson
(Uni of Hamburg)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Christopher Eckner
(University of Nova Gorica)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Prof.
Omar Kurtanidze
(Abastumani Observatory)
28/08/2018, 15:45
Extragalactic
Poster (A0 portrait)
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...
Mr
Thomas Edwards
(Grappa, University of Amsterdam)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Prof.
Makoto Narita
(National Institute of Technology, Okinawa College)
28/08/2018, 15:45
Cosmology
Poster (A0 portrait)
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...
Dr
Iurii Sushch
(DESY)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Dr
Maria Victoria del Valle
(Potsdam University)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Maria Magdalena Gonzalez
(Instituto de Astronomía, UNAM), Dr
Nissim Fraija
(Instituto de Astronomia, UNAM)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Xavier Rodrigues
(DESY)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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....
Rafael Alves Batista
(University of São Paulo)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Petr Satunin
(INR, Moscow)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Norita Kawanaka
(Kyoto University)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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...
Dr
Andrey Timokhin
(NASA/GSFC)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Mr
Dylan van Arneman
(University of Amsterdam), Mr
Marnix Reemst
(University of Amsterdam)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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, $\nu_i + \gamma \to \nu_j$,...
19.
Primordial Anisotropies in the Gravitational Wave Background from Cosmological Phase Transitions
Dr
Geller Michael
(University of Maryland)
28/08/2018, 15:45
GW and followup
Poster (A0 portrait)
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...
Mr
Robert Stein
(DESY Zeuthen)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Oleg Popov
(Seoul Netional University of Technology and Science)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Prof.
Chian-Shu Chen
(Department of Physics, Tamkang University)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Ranjan Laha
(Johannes Gutenberg University Mainz)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Dr
Fabian Schussler
(CEA-Saclay)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Thomas Huber
(Herr)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
- 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...
Prof.
Sergey Troitsky
(INR, Moscow)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Mr
Kevin Almeida Cheminant
(Institute of Nuclear Physics Polish Academy of Science)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Dr
Maria Magdalena González Sánchez
(Universidad Nacional Autónoma de México - Instituto de Astronomía), Dr
Nissim Illich Fraija Cabrera
(Universidad Nacional Autónoma de México - Instituto de Astronomía), Dr
Simone Dichiara
(Universidad Nacional Autónoma de México)
28/08/2018, 15:45
GW and followup
Poster (A0 portrait)
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...
Mr
Chad Brisbois
(Michigan Technological University)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Katrin Link
(KIT)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Alicia Wongel
(HEPHY)
28/08/2018, 15:45
Particle Physics
Poster (A0 portrait)
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...
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...
Maxim Laletin
(ULiege)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Mr
Martin Vollmann
(Technical University of Munich)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Daniele Fargion
(Physics Depart., ROME UNIVERSITY 1 and INFN)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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.
Dr
Anabella Araudo
(Astronomical Institute of the Czech Academy of Sciences)
28/08/2018, 15:45
Galactic
Poster (A0 portrait)
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...
Dr
Luca Foffano
(University of Padova)
28/08/2018, 15:45
Extragalactic
Poster (A0 portrait)
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...
Dr
Egor Zadeba
(MEPhI)
28/08/2018, 15:45
Cosmic Rays
Poster (A0 portrait)
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...
Sarah Mancina
(University of Wisconsin - Madison)
28/08/2018, 15:45
Neutrinos
Poster (A0 portrait)
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...
Dr
Michael Gustafsson
(Göttingen University)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Anabella Araudo
(Astronomical Institute of the Czech Academy of Sciences)
28/08/2018, 15:45
Extragalactic
Poster (A0 portrait)
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,...
Mr
Chao Zhang
(IEXP/Univ.Hamburg)
28/08/2018, 15:45
Dark Matter
Poster (A0 portrait)
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...
Dr
Jose Andres Garcia-Gonzalez
(IF-UNAM)
28/08/2018, 15:45
Gamma-rays
Poster (A0 portrait)
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...