Results 31 to 40 of about 4,193,334 (227)
Gamma-ray luminosity function of gamma-ray bright AGNs [PDF]
Research in Astronomy and Astrophysics, 2009 Detection of Gamma-ray emission from a class of active galactic nuclei (viz blazars), has been one of the important findings from the Compton Gamma Ray Observatory (CGRO). However, their Gamma-ray luminosity function has not been well determined. Few attempts have been made in earlier works, where BL Lacs and Flat Spectrum Radio Quasars (FSRQs) have ...
Bhattacharya, Debbijoy +2 more
openaire +2 more sources
NEW FERMI-LAT EVENT RECONSTRUCTION REVEALS MORE HIGH-ENERGY GAMMA RAYS FROM GAMMA-RAY BURSTS [PDF]
, 2013 Based on the experience gained during the four and a half years of the mission, the Fermi-LAT Collaboration has undertaken a comprehensive revision of the event-level analysis going under the name of Pass 8.
W. Atwood +18 more
semanticscholar +1 more source
Dense electron-positron plasmas and bursts of gamma-rays from laser-generated quantum electrodynamic plasmas [PDF]
, 2013 In simulations of a 12.5 PW laser (focussed intensity I=4×1023Wcm−2) striking a solid aluminum target, 10% of the laser energy is converted to gamma-rays.
C. Ridgers +6 more
semanticscholar +1 more source
Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth [PDF]
Science, 2017 Exotic origin for cosmic positrons Several cosmic-ray detectors have found more positrons arriving at Earth than expected. Some researchers interpret this as a signature of exotic physics, such as the annihilation of dark matter particles.
A. Abeysekara +115 more
semanticscholar +1 more source
Absorption of High Energy Gamma Rays by Interactions with Extragalactic Starlight Photons at High Redshifts [PDF]
, 1997 We extend earlier calculations of the attenuation suffered by gamma rays during their propagation from extragalactic sources, obtaining new extinction curves for gamma rays down to 10 GeV in energy, from sources up to a redshift of z=3.Comment: 5 pages ...
Salamon, M. H., Stecker, F. W.
core +2 more sources
Particles, Strings and Cosmology (PASCOS 99), 2000 Ultra-high-energy, >10^19 eV, cosmic-ray and high energy, ~10^14 eV, neutrino production in GRBs is discussed in the light of recent GRB and cosmic-ray observations. Emphasis is put on model predictions that can be tested with operating and planned cosmic-ray and neutrino detectors, and on the prospects of testing for neutrino properties.
openaire +2 more sources
Analyzing {\gamma}-rays of the Galactic Center with Deep Learning [PDF]
, 2018 We present a new method to interpret the $\gamma$-ray data of our inner Galaxy as measured by the Fermi Large Area Telescope (Fermi LAT). We train and test convolutional neural networks with simulated Fermi-LAT images based on models tuned to real data ...
Caron, Sascha +3 more
core +3 more sources
Transparency of the Universe to gamma-rays [PDF]
, 2013 Using the most recent observational data concerning the Extragalactic Background Light and the Radio Background, for a source at a redshift z_s < 3 we compute the energy E_0 of an observed gamma-ray photon in the range 10 GeV < E_0 < 10^13 GeV such that ...
A. Angelis, G. Galanti, M. Roncadelli
semanticscholar +1 more source
, 2000 The reaction 28Si + 181Ta has been studied at E(Lab) = 125 and 135 MeV. Coincidences between high energy particles and various X- and gamma-rays from abnormally long-lived states were observed. e.g.
A. MARINOV +7 more
core +2 more sources
Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays [PDF]
, 2012 We consider multi-messenger constraints on very heavy dark matter (VHDM) from recent Fermi gamma-ray and IceCube neutrino observations of isotropic background radiation.
K. Murase, J. Beacom
semanticscholar +1 more source