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Magnetic turbulence in cool cores of galaxy clusters

✍ Scribed by C. Vogt; T. A. Enßlin

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
102 KB
Volume
327
Category
Article
ISSN
0004-6337

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✦ Synopsis

Abstract

The analysis of Faraday rotation measurements (RM) gives insight into the properties of cluster magnetic fields. Recently, Kolmogorov‐like magnetic turbulence was reported for the cool core of the Hydra A galaxy cluster which was derived using a maximum likelihood analysis of an RM map of this cluster (Vogt & Enßlin 2005). Here, we present our understanding of this power spectrum by kinetic energy injection through active galaxies which drive a turbulent non‐helical magnetic dynamo. We develop an analytical model of the turbulence in cool cores and show that it fits well to Faraday rotation measurements for a number of cool core clusters. Moreover, our model allows predictions for magnetic fields in clusters in which the appropriate observational information is still missing, and allows predictions for yet unobserved quantities like the hydrodynamical turbulence velocity and characteristic length scale, and suggests some level of magnetic intermittency and large‐scale hydrodynamic viscosity. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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