NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T11:25:23 PDT
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For refcode 1991ApJ...379...80K:
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1991ApJ...379...80K DETECTION OF EXCESS ROTATION MEASURE DUE TO INTRACLUSTER MAGNETIC FIELDS IN CLUSTERS OF GALAXIES K.-T. KIM Department of Astronomy, University of Toronto, Toronto, Ontario M5S 1A7, Canada PETER C. TRIBBLE Canadian Institute for Theoretical Astrophysics, 60 Saint George Street, Toronto M5S 1A1, Canada AND P. P. KRONBERG Department of Astronomy, University of Toronto,Toronto, Ontario M5S 1A7, Canada Received 1990 December 3; accepted 1991 March 28 ABSTRACT The Faraday rotation measures of a sample of extragalactic radio sources projected within a third of an Abell radius of a galaxy cluster were compared with those of sources located further from cluster centers. The result strongly indicates that the distribution of the residual rotation measure (RRM) in the former population is broadened, at a confidence level exceeding 99%. The broadening is detectable out to 1h^-1^_50_ Mpc. Our best estimate of the excess Faraday rotation measure varies from 100+/-36 rad m^-2^ in the central sixth of an Abell radius to 36+/-15 rad m^-2^ further out. The combination of these results with electron densities determined from X-ray data for some of the clusters suggests that magnetic field strengths in cluster gas are of order 1 microgauss. Subject headings: galaxies: clustering - galaxies: intergalactic medium - magnetic fields - polarization
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