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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 

References

Blasi, P. 2000, ApJ Lett., submitted.Google Scholar
Dermer, C. D., Miller, J. A., & Li, H. 1996, ApJ, 456, 106.Google Scholar
Ensslin, T. A., Lieu, R., & Biermann, P. L. 1999, A&A, 344, 409.Google Scholar
Fusco-Femiano, R., et al. 1999, astro-ph/9901018, preprint.Google Scholar
Hughes, J. P., Butcher, J. A., Stewart, G. C., & Tanaka, Y. 1993, ApJ, 404, 611.Google Scholar
Lieu, R., Ip, W.-H., Axford, W. I., & Bonamente, M. 1999, ApJ, 510, L25.CrossRefGoogle Scholar
Nayakshin, S., & Melia, F. 1998, ApJ, 114, 269.Google Scholar