Mathematics – Logic
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50..261f&link_type=abstract
Acta Astronomica Sinica, vol. 50, no. 3, p. 261-270
Mathematics
Logic
Gamma Rays: Observations, Quasars: General, Galaxies: Active
Scientific paper
EGRET has updated the value of the diffused γ-ray background which is confused in origin. Meanwhile, it has revealed a population of γ-ray sources with no radio counterparts which are isotropically distributed in the sky, and probably with cosmological origins. Wang (2008) has proposed a new γ-ray radiation scenario driven by AGN feedback. The radiation peaks around 1GeV-0.1TeV with a typical luminosity of 10^42-10^43 ergs/s. This scenario makes radio quiet quasars potential γ-ray sources as well as contributors to γ-ray background. Photons from disks of quasars or CMB photons are scattered by electrons in inverse-Compton (IC) processes. Radiation from the former process takes up 78-92% of the γ-ray background around 1GeV, while radiation from the later process is negligible. Thus radio quiet quasars are likely to be the most important contributors to the γ-ray background around 1 GeV.
Feng Min-Zi
Wang Janet M.
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