Results 21 to 30 of about 596,755 (352)

Black Hole Accretion in Gamma Ray Bursts

Galaxies, 2017
We study the structure and evolution of the hyperaccreting disks and outflows in the gamma ray bursts central engines. The torus around a stellar mass black hole is composed of free nucleons, Helium, electron-positron pairs, and is cooled by neutrino ...
Agnieszka Janiuk, Michal Bejger, Petra Sukova, Szymon Charzynski   +3 more
doaj   +1 more source

EXTRAGALACTIC GAMMA-RAYS: GAMMA RAY BURSTS AND BLAZARS [PDF]

International Journal of Modern Physics A, 2005
The extragalactic gamma-ray sky is dominated by two classes of sources: Gamma-Ray Bursts (GRBs) and radio loud active galactic nuclei whose jets are pointing at us (blazars). We believe that the radiation we receive from them originates from the transformation of bulk relativistic energy into random energy.
openaire   +3 more sources

Gamma-Rays from Kilonovae and the Cosmic Gamma-Ray Background [PDF]

The Astrophysical Journal, 2020
Abstract The recent detection of the gravitational-wave event GW170817, produced by the coalescence of two neutron stars, and of its optical–infrared counterpart, powered by the radioactive decay of r-process elements, has opened a new window onto gamma-ray astronomy: the direct detection of photons coming from such decays.
Pilar Ruiz-Lapuente, Oleg Korobkin, Oleg Korobkin   +2 more
openaire   +5 more sources

Flare Duty Cycle of Gamma-Ray Blazars and Implications for High-energy Neutrino Emission

The Astrophysical Journal, 2023
Gamma-ray flares of blazars may be accompanied by high-energy neutrinos due to interactions of high-energy cosmic rays in the jet with photons, as suggested by the detection of the high-energy neutrino IceCube-170922A during a major gamma-ray flare from ...
Kenji Yoshida, Maria Petropoulou, Kohta Murase, Foteini Oikonomou   +3 more
doaj   +1 more source

Gamma-ray binaries [PDF]

Astrophysics and Space Science, 2007
Recent observations have shown that some compact stellar binaries radiate the highest energy light in the universe. The challenge has been to determine the nature of the compact object and whether the very high energy gamma-rays are ultimately powered by pulsar winds or relativistic jets.
openaire   +3 more sources

Gamma ray transport simulations using SGaRD code

EPJ Nuclear Sciences & Technologies, 2017
SGaRD (Spectroscopy, Gamma rays, Rapid, Deterministic) code is used for the fast calculation of the gamma-ray spectrum, produced by a spherical shielded source and measured by a detector.
Humbert Philippe, Méchitoua Boukhmès
doaj   +1 more source

Critical Tests of Leading Gamma Ray Burst Theories

Universe, 2022
It has been observationally established that supernovae (SNe) of Type Ic produce long duration gamma-ray bursts (GRBs) and that neutron star mergers generate short hard GRBs.
Shlomo Dado, Arnon Dar, Alvaro De Rújula   +2 more
doaj   +1 more source

The GAMMA-400 gamma-ray telescope for precision gamma-ray emission investigations

Journal of Physics: Conference Series, 2016
The GAMMA-400 gamma-ray telescope with excellent angular and energy resolutions is designed to search for signatures of dark matter in the fluxes of gamma-ray emission and electrons + positrons. Precision investigations of gamma-ray emission from Galactic Center, Crab, Vela, Cygnus, Geminga, and other regions will be performed, as well as diffuse gamma-
R. Aptekar, V. A. Loginov, M. D. Kheymits, J. E. Ward, Mirko Boezio, E. Mocchiutti, A. Vacchi, Yu. I. Stozhkov, P. Cumani, E Berti, E. M. Tyurin, V. A. Dogiel, Felix Ryde, S. B. Ricciarini, Alexey Leonov, Alexey Leonov, Miriam Lucio Martinez, Nikolay Topchiev, A. A. Taraskin, M. Bongi, A. M. Galper, A. M. Galper, Marco Tavani, C. De Donato, N. Zampa, Bohdan Hnatyk, Francesco Longo, J. M. Paredes, G. I. Vasilyev, A.I. Arkhangelskiy, G Bigongiari, Nicola Mori, Piero Spillantini, Igor V. Moskalenko, A. V. Bakaldin, V. G. Zverev, O.D. Dalkarov, L. Bergstrom, P. Picozza, O. Adriani, N Finetti, Mark Pearce, Vladimir Kaplin, Maxim S. Gorbunov, Paolo Maestro, S. I. Suchkov, I. V. Arkhangelskaja, Valery Korepanov, V. Bonvicini, E. Vannuccini, A. Rappoldi, Josefin Larsson, P.W. Cattaneo, P. Yu. Naumov, G. Castellini, O. V. Serdin, M. Ulanov, P S Marrocchesi, V. N. Zirakashvili, A Tiberio, G. L. Dedenko, S. G. Bobkov, David Gascon, Lorenzo Bonechi, A. A. Kaplun, V. V. Kadilin, E. A. Bogomolov, A. L. Menshenin, V. V. Mikhailov, Roberta Sparvoli, Y. u. V. Gusakov, S. Bottai, A. A. Moiseev, M. F. Runtso, Yu. T. Yurkin, P. Papini   +75 more
openaire   +5 more sources

GAMMA-RAY OBSERVATIONS OF GAMMA-RAY BINARIES [PDF]

International Journal of Modern Physics: Conference Series, 2014
Gamma-ray binaries are binary systems that emit most of their radiative output above 1 MeV. Following the detection of five such systems in the past decade, they have been clearly established as a population of galactic GeV and TeV sources. In this review I discuss their recent gamma-ray observational results from Cherenkov telescopes and the Fermi ...
openaire   +1 more source

Effect of irradiation treatment on the functional properties of flavonoid extracts

Applied Food Research, 2023
In this study,  Pueraria mirifica, Hawthorn, and soy flavonoid extracts were irradiated with 60CO-γ rays to investigate the effects of different irradiation doses on the storage performance, antibacterial properties, and antioxidant activity of flavonoid
Xiaoqin Huang, Haiguang Chen, Xiaoyu Wang, Bifeng Lan, Jiaoying Cai   +4 more
doaj   +1 more source