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Stochastic Acceleration and Nonthermal Radiation in Clusters of Galaxies

Published online by Cambridge University Press:  25 May 2016

P. Blasi  and
A. Olinto
P. Blasi
Affiliation:
Department of Astronomy & Astrophysics, The University of Chicago and E. Fermi Institute, 5640 S. Ellis Av., Chicago, IL 60637, U.S.A.
A. Olinto
Affiliation:
Department of Astronomy & Astrophysics, The University of Chicago and E. Fermi Institute, 5640 S. Ellis Av., Chicago, IL 60637, U.S.A.

Abstract

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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 δB2/B2 ~ 3% for a magnetic field B on the order of μG. Despite the reasonable values for these parameters, a large rate of injection of waves is needed to compensate the damping of the waves.

Type
Part II: Posters
Information
Symposium - International Astronomical Union , Volume 195: Highly Energetic Physical Processes and Mechanisms , 2000 , pp. 379 - 380
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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