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.
Keywords
Cite
@article{arxiv.astro-ph/0702083,
title = {Angular Anisotropies in the Cosmic Gamma-ray Background as a Probe of its Origin},
author = {Francesco Miniati and Savvas M. Koushiappas and Tiziana Di Matteo},
journal= {arXiv preprint arXiv:astro-ph/0702083},
year = {2009}
}
Comments
4 pages, 3 figures. Replaced to match version accepted for publication in Astrophys. J. Lett