The Unresolved Blazar Component Of The Extragalactic Gamma-ray Background

Details The Unresolved Blazar Component Of The Extragalactic Gamma-ray Background The Unresolved Blazar Component Of The Extragalactic Gamma-ray Background

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0721s&link_type=abstract

American Astronomical Society, HEAD meeting #12, #7.21

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new theoretical estimate of the relative contribution of unresolved blazars to the extragalactic gamma-ray background (EGB). We find that the Fermi source count data do not rule out a scenario in which the EGB is dominated by emission from unresolved blazars, though unresolved star-forming galaxies may also contribute significantly to the background, within order-of-magnitude uncertainties (see Venters & Stecker abstract). The spectrum of unresolved FSRQs, when accounting for the energy-dependent effects of source confusion, could be consistent with the combined spectrum of the low-energy EGRET EGB measurements and the Fermi-LAT EGB measurements.

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