Stochastic Acceleration and Nonthermal Radiation in Clusters of Galaxies

Details Stochastic Acceleration and Nonthermal Radiation in Clusters of Galaxies Stochastic Acceleration and Nonthermal Radiation in Clusters of Galaxies

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000iaus..195..379b&link_type=abstract

Highly Energetic Physical Processes and Mechanisms for Emission from Astrophysical Plasmas, Proceedings of IAU Symposium #195, h

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study the possibility that the recently detected hard X-ray excess from some clusters of galaxies is due to bremsstrahlung emission of a nonthermal tail in the electron distribution produced by stochastic acceleration in a background of MHD waves. We find that this scenario requires an overall level of fluctuations which is only "δ B"2 / B2 ~ 3% for a magnetic field B on the order of microgauss. Despite the reasonable values for these parameters, a large rate of injection of waves is needed to compensate the damping of the waves.

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