27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Poster Session and Coffee Break

Place

Location: LVH, Luisenstraße 58, 10117 Berlin
Address: LANGENBECK VIRCHOW HAUS Luisenstraße 58, 10117 Berlin
Date: 28 Aug 15:45 - 4:45 PM

Contribution List

Displaying 86 contributions out of 86
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45
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 28/8/2018 at 13:45