Magnetic-field fluctuations around the radio galaxy 3C 31

Details Magnetic-field fluctuations around the radio galaxy 3C 31 Magnetic-field fluctuations around the radio galaxy 3C 31

2007-10-04

arxiv.org/abs/0710.1067v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, T. A. Rector and D. S. De

Scientific paper

We present an analysis of the magnetic-field fluctuations in the magnetoionic medium in front of the radio galaxy 3C 31 derived from rotation-measure (RM) fits to high-resolution polarization images. We first show that the Faraday rotation must be due primarily to a foreground medium. We determine the RM structure functions for different parts of the source and infer that the simplest form for the power spectrum is a power law with a high-frequency cutoff. We also present three-dimensional simulations of RM produced by a tangled magnetic field in the hot plasma surrounding 3C 31, and show that the observed RM distribution is consistent with a spherical plasma distribution in which the radio source has produced a cavity.

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