Results 121 to 130 of about 2,024 (209)

Fermi Unassociated Sources in the MeerKAT Absorption Line Survey

open access: yesThe Astrophysical Journal
Over 2000 γ -ray sources identified by the Large Area Telescope on NASA's Fermi Gamma-ray Space Telescope are considered unassociated, meaning that they have no known counterparts in any other frequency regime.
Morgan Himes   +10 more
doaj   +1 more source

Sixteen Years of Gamma-Ray Discoveries and AGN Observations with Fermi-LAT

open access: yesParticles
In June 2024, the Fermi Gamma-Ray Space Telescope (FGST) celebrated its 16th year of operations. The Fermi Large Area Telescope (Fermi-LAT) is the main instrument onboard the FGST satellite and is designed to be sensitive to γ-rays in the energy range ...
Fausto Casaburo   +3 more
doaj   +1 more source

Achievements of the Fermi Gamma - ray Space Telescope in 2018

open access: yesAchievements of the Fermi Gamma - ray Space Telescope in 2018
第19回宇宙科学シンポジウム (2019年1月9日-10日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)相模原キャンパス), 相模原市, 神奈川県 19th Space Science Symposium (January 9-10, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)Sagamihara Campus), Sagamihara, Kanagawa Japan 著者人数: 29名 資料番号: SA6000144071 レポート番号: P ...
openaire  

Discerning Misclassified Flat-spectrum Radio Quasars from Low-frequency-peaked BL Lacertae Objects

open access: yesThe Astrophysical Journal Supplement Series
A sample of 312 low-frequency-peaked BL Lacertae objects (LBLs) and 694 flat-spectrum radio quasars (FSRQs) with the parameters of both redshift and gamma-ray photon spectral index (Γ _γ ) is compiled from the Fourth Catalog of Active Galactic Nuclei ...
S. Liang   +3 more
doaj   +1 more source

Time-averaging Polarimetric and Spectral Properties of Gamma-Ray Bursts

open access: yesThe Astrophysical Journal Supplement Series
The composition and radiation mechanism of gamma-ray bursts (GRBs) within jets continue to be hotly debated. Investigating the joint polarimetric and spectral properties is crucial for understanding the composition and radiation mechanism of GRBs ...
Liang Li, Soroush Shakeri
doaj   +1 more source

Energy-dependent intrinsic time delay of gamma-ray bursts on testing Lorentz invariance violation

open access: yesPhysics Letters B
High-energy photons of gamma-ray bursts (GRBs) might be emitted at different intrinsic times with energy dependence at the source. In this letter, we expand the model from previous works on testing the Lorentz Invariance Violation (LV) with the observed ...
Hanlin Song, Bo-Qiang Ma
doaj   +1 more source

Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes [PDF]

open access: yes, 2012
The diffuse galactic {gamma}-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements by the Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compton Gamma-Ray Observatory ...
Anderson, B.   +20 more
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