Components of the Extragalactic Gamma Ray Background

Details Components of the Extragalactic Gamma Ray Background Components of the Extragalactic Gamma Ray Background

2010-12-16

arxiv.org/abs/1012.3678v2

Astrophys. J. 736, 40 (2011)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

version accepted for publication in the Astrophysical Journal

Scientific paper

We present new theoretical estimates of the relative contributions of unresolved blazars and star-forming galaxies to the extragalactic gamma-ray background (EGB) and discuss constraints on the contributions from alternative mechanisms such as dark matter annihilation and truly diffuse gamma-ray production. 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. In addition, we find that the spectrum of the unresolved star-forming galaxy contribution cannot explain the EGB spectrum found by EGRET at energies between 50 and 200 MeV, whereas 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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