Turbulent generation of intracluster magnetic fields and Faraday rotation measurements

Details Turbulent generation of intracluster magnetic fields and Faraday rotation measurements Turbulent generation of intracluster magnetic fields and Faraday rotation measurements

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..518g&link_type=abstract

Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 518-528.

Astronomy and Astrophysics

Astronomy

63

Faraday Effect, Galactic Clusters, Intergalactic Media, Interstellar Magnetic Fields, Magnetohydrodynamics, Milky Way Galaxy, Radio Sources (Astronomy), Statistical Analysis

Scientific paper

Statistical analysis of relatively large samples of Faraday rotation measurements of radio sources seen through clusters of galaxies recently led Kim et al. (1990) to conclude that magnetic fields of microgauss strength were present in clusters of galaxies. These samples are here checked for the possible effects of Galactic contamination, of a selection bias due to inclusion of cluster sources into the test sample, and of cooling flows. No statistically significant evidence is found for the loose selection criteria affecting results. Comparisons of the likely spatial distributions of the fields and relativistic electrons yield relations between field values derived from Faraday rotation and combined radio and high-energy X measurements. The observational results are compared with predictions of the turbulent dynamo theory of magnetic field generation in clusters. In order to account for the observed rotation measures, turbulent dynamo models require prohibitively high field values. This and other considerations lead to the conclusion that current turbulent dynamo models cannot viably account for the observed properties of intracluster fields.

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