Evolution of Intracluster Cosmic Rays and Gamma-Ray Emission

Details Evolution of Intracluster Cosmic Rays and Gamma-Ray Emission Evolution of Intracluster Cosmic Rays and Gamma-Ray Emission

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2655t&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The effect of merger history of clusters of galaxies on intra-cluster cosmic rays (ICCRs) is investigated. Though the effect of merger shock, which is responsible for (in-situ) acceleration of ICCRs, is ignored here, the effect of evolution is important for ICCRs and induced gamma-rays. Taking star formation history into account, we find 1) the gamma-ray flux from a cluster of galaxies is consistent with EGRET observation, and the detection by the GLAST is possible, and 2) the contribution of clusters of galaxies to the diffuse gamma-ray background is not so large, with reasonable parameter range.

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