Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background

Details Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background

2012-02-23

arxiv.org/abs/1202.5309v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures

Scientific paper

We place new constraints on the contribution of blazars to the large-scale isotropic gamma-ray background (IGRB) by jointly analyzing the measured source count distribution (log N-log S) of blazars and the measured intensity and anisotropy of the IGRB. We find that these measurements point to a consistent scenario in which unresolved blazars make less than 30% of the IGRB intensity at 1-10 GeV while accounting for the majority of the measured anisotropy in that energy band. These results indicate that the remaining fraction of the IGRB intensity is made by a component with a low level of intrinsic anisotropy.

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