Non-thermal Cosmic Backgrounds and prospects for future high-energy observations of blazars

Details Non-thermal Cosmic Backgrounds and prospects for future high-energy observations of blazars Non-thermal Cosmic Backgrounds and prospects for future high-energy observations of blazars

2006-02-10

arxiv.org/abs/astro-ph/0602243v1

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, Invited talk at the meeting "Gamma Wave 2005", Bonifacio, September 2005. To be published in "Experimenta

Scientific paper

We discuss the contribution of the blazar population to the extragalactic background radiation across the electromagnetic (e.m.) spectrum with particular reference to the microwave, hard-X-ray and gamma-ray bands. Our estimates are based on a recently derived blazar radio LogN-LogS that was built by combining several radio and multi-frequency surveys. We show that blazar emission integrated over cosmic time gives rise to a considerable broad-band non-thermal cosmic background that dominates the extragalactic brightness in the high-energy part of the e.m. spectrum. We also estimate the number of blazars that are expected to be detected by future planned or hypothetical missions operating in the X-ray and gamma-ray energy bands.

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