Angular Anisotropies in the Cosmic Gamma-ray Background as a Probe of its Origin

Abstract

Notwithstanding the advent of the Gamma-ray Large Area Telescope, theoretical models predict that a significant fraction of the cosmic gamma-ray background (CGB), at the level of 20% of the currently measured value, will remain unresolved. The angular power spectrum of intensity fluctuations of the CGB contains information on its origin. We show that probing the latter from a few tens of arcmin to several degree scales, together with complementary GLAST observations of gamma-ray emission from galaxy clusters and the blazars luminosity function, can discriminate between a background that originates from unresolved blazars or cosmic rays accelerated at structure formation shocks.

4 pages, 3 figures. Replaced to match version accepted for publication in Astrophys. J. Lett

References in corpus (3)

• The Starburst Contribution to the Extra-Galactic Gamma-Ray Background
• Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of cosmic gamma-ray background
• Angular power spectrum of gamma-ray sources for GLAST: blazars and clusters of galaxies

Cited by in corpus (4)

• Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background
• Angular Signatures of Annihilating Dark Matter in the Cosmic Gamma-Ray Background
• Power spectrum tomography of dark matter annihilation with local galaxy distribution
• Inverse Compton gamma-rays from Galactic dark matter annihilation: Anisotropy signatures