Francesco Miniati et al 2007 ApJ 667 L1 doi:10.1086/522085
Francesco Miniati1, Savvas M. Koushiappas2 and Tiziana Di Matteo3
Show affiliationsNotwithstanding the advent of the Gamma-ray Large Area Space Telescope, theoretical models predict that a significant fraction of the cosmic γ-ray background (CGB), at a 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 on scales from a few tens of arcminutes to several degrees, together with complementary GLAST observations of γ-ray emission from galaxy clusters and the blazar luminosity function, can discriminate between a background that originates from unresolved blazars or cosmic rays accelerated at structure formation shocks.
diffuse radiation; gamma rays: theory; large-scale structure of universe
Issue 1 (2007 September 20)
Received 2007 February 2, accepted for publication 2007 August 3
Published 2007 August 29
Francesco Miniati et al 2007 ApJ 667 L1
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