Results 51 to 60 of about 26,003 (179)

Identifying the Gamma-Ray Emission of the Nearby Galaxy M83

open access: yesThe Astrophysical Journal, 2023
We report on the detection of a γ -ray source at the position of the nearby star-forming galaxy (SFG) M83, which is found from our analysis of 14 yr of the data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (Fermi ...
Yi Xing, Zhongxiang Wang
doaj   +1 more source

Fast γ-ray Variability: A Common Feature and Powerful Probe for Jetted AGNs

open access: yesGalaxies, 2018
Among the highly dynamical non-thermal universe, flashes of γ-ray photons from jets in active galactic nuclei (AGNs) are always attractive. Not only are they extraordinary observational phenomena, but they also become powerful probes of the jets ...
Neng-hui Liao
doaj   +1 more source

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

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

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

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

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

15 GHz Monitoring of Gamma-ray Blazars with the OVRO 40 Meter Telescope in Support of Fermi [PDF]

open access: yes, 2009
We present results from the first two years of our fast-cadence 15 GHz gamma-ray blazar monitoring program, part of the F-GAMMA radio monitoring project.
Angelakis, E.   +14 more
core   +2 more sources

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

Home - About - Disclaimer - Privacy