Large Cosmic Shock Waves as Sites for Particle Acceleration

Details Large Cosmic Shock Waves as Sites for Particle Acceleration Large Cosmic Shock Waves as Sites for Particle Acceleration

1999-06-09

arxiv.org/abs/astro-ph/9906169v1

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in the Proceedings of 26th International Cosmic Ray Conference (Salt Lake City, 1999)

Scientific paper

The properties of cosmic shock waves are studied through numerical simulations in two cosmological scenarios (SCDM and LCDM). The scaling relations for the average radius and velocity associated with the accretion shocks are somewhat different, yet qualitatively similar to the self similar solutions for a flat Omega_M=1 universe. The energy supplied by infalling gas at accretion shock waves is large enough to sustain production of abundant cosmic ray populations if a viable acceleration mechanism can take place there. Finally, in addition to shocks created by the encounter of the merging ICMs of two clusters of galaxies, accretion shocks associated with the merging clusters generate strong ``relic'' shocks which propagate through the ICM producing additional heating of the ICM, and associated CR acceleration.

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