Results 21 to 30 of about 19,895 (210)

High-energy gamma- and cosmic-ray observations with future space-based GAMMA-400 gamma-ray telescope [PDF]

open access: yesEPJ Web of Conferences, 2019
The future space-based GAMMA-400 gamma-ray telescope will be installed on the Navigator platform of the Russian Astrophysical Observatory. A highly elliptical orbit will provide observations for 7-10 years of many regions of the celestial sphere ...
Topchiev N.P.   +17 more
doaj   +1 more source

Probing photon-ALP oscillations from the flat spectrum radio quasar 4C+21.35

open access: yesPhysics Letters B, 2022
Flat spectrum radio quasar (FSRQ) is the most luminous blazar at the GeV energies. In this paper, we probe the photon-axion-like particle (ALP) oscillation effect on the latest very-high-energy (VHE) γ-ray observations of the FSRQ 4C+21.35 (PKS 1222+216).
Hai-Jun Li
doaj   +1 more source

High Energy Observational Investigations of Supernova Remnants and their Interactions with Surroundings [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2013
Here we review the effort of Fermi Asian Network (FAN) in exploring the supernova remnants (SNRs) with state-of-art high energy observatories, including Fermi Gamma-ray Space Telescope and Chandra X-ray Observatory, in the period of 2011- 2012 ...
Chung-Yue Hui
doaj   +1 more source

MeV gamma-ray constraints for light dark matter from semi-annihilation

open access: yesPhysics Letters B, 2023
Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally.
Jun Guo, Lei Wu, Bin Zhu
doaj   +1 more source

Discovery of gamma-ray emission from the supernova remnant Kes 17 with Fermi Large Area Telescope [PDF]

open access: yes, 2011
We report the discovery of GeV emission at the position of supernova remnant Kes 17 by using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope.
Cheng, K. S.   +6 more
core   +2 more sources

A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources

open access: yesThe Astrophysical Journal, 2023
Approximately one-third of existing γ -ray sources identified by the Fermi Gamma-Ray Space Telescope are considered to be unassociated, with no known counterpart at other frequencies/wavelengths.
S. Bruzewski   +2 more
doaj   +1 more source

Light speed variation from gamma ray bursts: criteria for low energy photons

open access: yesEuropean Physical Journal C: Particles and Fields, 2018
We examine a method to detect the light speed variation from gamma ray burst data observed by the Fermi Gamma-ray Space Telescope (FGST). We suggest new criteria to determine the characteristic time for low energy photons by the energy curve and the ...
Yue Liu, Bo-Qiang Ma
doaj   +1 more source

Spider Invasion Across the Galaxy [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2014
The nature of the exotic stellar corpses which reincarnate by consuming their companion is reviewed. Apart from sucking life from their partners, they are actually eating the doomed companions away by their deadly and powerful particle/radiation beams.
Chung-Yue Hui
doaj   +1 more source

The VLBA-BU-BLAZAR Multi-Wavelength Monitoring Program

open access: yesGalaxies, 2016
We describe a multiwavelength program of monitoring of a sample of bright γ-ray blazars, which the Boston University (BU) group has being carrying out since June 2007.
Svetlana Jorstad, Alan Marscher
doaj   +1 more source

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