Particle Acceleration in Clusters of Galaxies

Details Particle Acceleration in Clusters of Galaxies Particle Acceleration in Clusters of Galaxies

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2059t&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

Clusters of galaxies have non-thermal high energy particles as well as the thermal intracluster medium in the intracluster space. One bit of direct evidence is the existence of non-thermal synchrotron radio halos and relics. However, it is still unclear how they are accelerated. Here, we consider two kinds of acceleration processes which likely work in the intracluster space and intro duce models based on them. One is shock acceleration associated with cluster mergers. We calculate evolution of non-thermal electrons during cluster merger based on N-b o dy + SPH simulations. Radio emission is localized near the shocks. This is qualitatively similar to radio relics. The other is resonant scattering of random Alfv´n waves. e We calculate steady state electron distribution functions when Alfv´n wave power e spectra are power-law. We successfully repro duce the Coma cluster radio halo spectrum.

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