Shock Acceleration and gamma radiation in Clusters of Galaxies

Details Shock Acceleration and gamma radiation in Clusters of Galaxies Shock Acceleration and gamma radiation in Clusters of Galaxies

2003-05-14

arxiv.org/abs/astro-ph/0305251v1

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of the 28th International Cosmic Ray Conference, July 31 - August 7, 2003, Tsukuba, Japan

Scientific paper

The nonthermal radiation observed from a handfull of clusters of Galaxies is the proof that particle acceleration occurs in the intracluster medium. It is often believed that shock surfaces associated with either mergers of clusters of galaxies, or with the cosmological inflow of matter onto clusters during structure formation may be the sites for acceleration. We discuss here the effectiveness of shock acceleration in the intracluster medium, stressing that merger related shocks are typically weak, at least for the so-called major mergers. We investigate the implications of shock strengths for gamma ray emission from single clusters of galaxies and for their detectability with future gamma ray experiments such as GLAST. We also discuss the contribution of clusters of galaxies to the extragalactic diffuse gamma ray background.

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