Low-State Gamma-Ray Emission from Blazars and the Gamma-Ray Background

Details Low-State Gamma-Ray Emission from Blazars and the Gamma-Ray Background Low-State Gamma-Ray Emission from Blazars and the Gamma-Ray Background

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476....7k&link_type=abstract

Astrophysical Journal v.476, p.7

Astronomy and Astrophysics

Astronomy

15

Cosmology: Diffuse Radiation, Gamma Rays: Observations

Scientific paper

We examine the contribution of flat spectrum radio sources (FSRSs), or blazars, to the diffuse gamma-ray background (DGRB), prompted by the association of the extragalactic gamma -ray sources detected by the EGRET instrument aboard the Compton Gamma Ray Observatory (CGRO) with this class of objects by using their well-studied log N--log S distribution. The basic assumption of our study are that (1) there exists steady state gamma -ray emission at the EGRET energy band from the entire population of FSRSs with gamma -ray luminosity that is proportional to their radio luminosity, i.e., ( nu F nu )100 MeV = f( nu F nu )5 GHz; (2) the ensemble of blazars produce the DGRB. Under these assumptions, the estimated average value of the proportionality constant is ~= 70, compared to a mean observed value of obs ~= 750 seen among the EGRET-detected blazars. We explore the implications of this result for AGN models and address the results that should be achieved by the next generation of gamma -ray satellites.

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