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36 papers · 1 filter
Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?
T. A. Dzhatdoev, E. I. Podlesnyi, I. A. Vaiman
Primary very high energy -rays from -ray bursts (GRBs) are partially absorbed on extragalactic background light (EBL) photons with subsequent formation of intergalactic elect…
Observable spectral and angular distributions of -rays from extragalactic ultrahigh energy cosmic ray accelerators: the case of extreme TeV blazars
E. V. Khalikov, T. A. Dzhatdoev
Ultrahigh energy protons and nuclei from extragalactic cosmic ray sources initiate intergalactic electromagnetic cascades, resulting in observable fluxes of -rays in the GeV-TeV…
Identifying nearby sources of ultra-high-energy cosmic rays with deep learning
Oleg Kalashev, Maxim Pshirkov, Mikhail Zotov
We present a method to analyse arrival directions of ultra-high-energy cosmic rays (UHECRs) using a classifier defined by a deep convolutional neural network trained on a HEALPix g…
An extensive-air-shower-like event registered with the TUS orbital detector
B. A. Khrenov, G. K. Garipov, M. A. Kaznacheeva +17
TUS (Tracking Ultraviolet Set-up) is the world's first orbital detector of ultra-high-energy cosmic rays (UHECRs). It was launched into orbit on 28th April 2016 as a part of the sc…
Open Questions in Cosmic-Ray Research at Ultrahigh Energies
Rafael Alves Batista, Jonathan Biteau, Mauricio Bustamante +13
We review open questions and prospects for progress in ultrahigh-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the `The High-Energy Un…
Method of EAS's Cherenkov and fluorescent light separation using silicon photomultipliers
Dmitry Chernov, Elena Bonvech, Timur Dzhatdoev +7
Preliminary results on the development of a separation method for Cerenkov (CL) and fluorescence (FL) light from EAS are shown. The results are based on the measurement of attenuat…
Prospects of detecting a large-scale anisotropy of ultra-high-energy cosmic rays from a nearby source with the K-EUSO orbital telescope
O. Kalashev, M. Pshirkov, M. Zotov
KLYPVE-EUSO (K-EUSO) is a planned orbital detector of ultra-high-energy cosmic rays (UHECRs), which is to be deployed on board the International Space Station. K-EUSO is expected t…
A new universal cosmic-ray knee near the magnetic rigidity 10 TV with the NUCLEON space observatory
E. Atkin, V. Bulatov, V. Dorokhov +18
Data from the NUCLEON space observatory give a strong indication of the existence of a new universal cosmic ray "knee", which is observed in all groups of nuclei, including heavy n…
Muon content of extensive air showers: comparison of the energy spectra obtained by the Sydney University Giant Air-shower Recorder and by the Pierre Auger Observatory
J. A. Bellido, R. W. Clay, N. N. Kalmykov +4
The Sydney University Giant Air-shower Recorder (SUGAR) measured the energy spectrum of ultra-high-energy cosmic rays reconstructed from muon-detector readings, while the Pierre Au…
Low-Mass Dark Matter Search with the DarkSide-50 Experiment
The DarkSide Collaboration, P. Agnes, I. F. M. Albuquerque +192
We present the results of a search for dark matter WIMPs in the mass range below 20 GeV/c^2 using a target of low-radioactivity argon. The data were obtained using the DarkSide-50…
Overview on the Tunka-Rex antenna array for cosmic-ray air showers (ICRC 2017)
Frank G. Schröder
Tunka-Rex is a km large antenna array for cosmic-ray air showers at the TAIGA observatory in Siberia close to Lake Baikal. In autumn 2016 Tunka-Rex has been extended to a…
Solution of heliospheric propagation: unveiling the local interstellar spectra of cosmic ray species
M. J. Boschini, S. Della Torre, M. Gervasi +14
Local interstellar spectra (LIS) for protons, helium and antiprotons are built using the most recent experimental results combined with the state-of-the-art models for propagation…
A minimal model for extragalactic cosmic rays and neutrinos
M. Kachelriess, O. Kalashev, S. Ostapchenko +1
We aim to explain in a unified way the experimental data on ultrahigh energy cosmic rays (UHECR) and neutrinos, using a single source class and obeying limits on the extragalactic…
Energy Spectra of Abundant Cosmic-ray Nuclei in Sources, According to the ATIC Experiment
A. D. Panov, N. V. Sokolskaya, V. I. Zatsepin
One of the main results of the ATIC (Advanced Thin Ionization Calorimeter) experiment is a collection of energy spectra of abundant cosmic-ray nuclei: protons, He, C, O, Ne, Mg, Si…
Constraints on the flux of eV cosmic photons from the EAS-MSU muon data
Yu. A. Fomin, N. N. Kalmykov, I. S. Karpikov +5
Results of the search for eV primary cosmic-ray photons with the data of the Moscow State University (MSU) Extensive Air Shower (EAS) array are reporte…
The VHE anomaly in blazar spectra and related phenomena
T. Dzhatdoev, E. Khalikov, A. Kircheva +1
Most of the recent research on extragalactic -ray propagation focused on the study of the absorption process ("absorption-only model"). Starting from…
Testing models of extragalactic -ray propagation using observations of extreme blazars in GeV and TeV energy ranges
T. A. Dzhatdoev, E. V. Khalikov, A. P. Kircheva +1
We briefly review contemporary extragalactic γ-ray propagation models. It is shown that the Extragalactic Magnetic Field (EGMF) strength and structure are poorly known. Strict lowe…
No muon excess in extensive air showers at 100-500 PeV primary energy: EAS-MSU results
Yu. A. Fomin, N. N. Kalmykov, I. S. Karpikov +5
Some discrepancies have been reported between observed and simulated muon content of extensive air showers: the number of observed muons exceeded the expectations in HiRes-MIA, Yak…
Electromagnetic cascade masquerade: a way to mimic --axion-like particle mixing effects in blazar spectra
T. A. Dzhatdoev, E. V. Khalikov, A. P. Kircheva +1
Context. Most of the studies on extragalactic γ-ray propagation performed up to now only accounted for primary gamma-ray absorption and adiabatic losses ("absorption-only model").…
Fractionally charged particles in cosmic rays
George Bashindzhagyan, Natalia Korotkova
The results of many experiments on a search of fractionally charged particles in cosmic rays have been reviewed. The registered by ATIC and PAMELA experiments change of the proton…
Detection prospects of the Telescope Array hotspot by space observatories
D. Semikoz, P. Tinyakov, M. Zotov
In the present-day cosmic ray data, the strongest indication of anisotropy of the ultrahigh energy cosmic rays is the 20-degree hotspot observed by the Telescope Array with the sta…
A search for neutrino signal from dark matter annihilation in the center of the Milky Way with Baikal NT200
A. D. Avrorin, A. V. Avrorin, V. M. Aynutdinov +47
We reanalyze the dataset collected during the years 1998--2003 by the deep underwater neutrino telescope NT200 in the lake Baikal with the low energy threshold (10 GeV) in searches…
The optical identifcation of events with poorly defined locations: The case of the Fermi GBM GRB140801A
V. M. Lipunov, J. Gorosabel, M. V. Pruzhinskaya +50
We report the early discovery of the optical afterglow of gamma-ray burst (GRB) 140801A in the 137 deg 3- error-box of the Fermi Gamma-ray Burst Monitor (GBM). MASTER is the…
Testing and Performance of UFFO Burst Alert & Trigger Telescope
J. Ripa, M. B. Kim, J. Lee +26
The Ultra-Fast Flash Observatory pathfinder (UFFO-p) is a new space mission dedicated to detect Gamma-Ray Bursts (GRBs) and rapidly follow their afterglows in order to provide earl…