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Title:
Detection of excess rotation measure due to intracluster magnetic fields in clusters of galaxies
Authors:
Kim, K.-T.; Tribble, Peter C.; Kronberg, P. P.
Affiliation:
AA(Toronto, University, Canada), AB(Canadian Institute for Theoretical Astrophysics, Toronto, Canada), AC(Toronto, University, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 80-88. Research supported by NSERC and University of Toronto. (ApJ Homepage)
Publication Date:
09/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
EXTRAGALACTIC RADIO SOURCES, FARADAY EFFECT, GALACTIC CLUSTERS, INTERGALACTIC MEDIA, MAGNETIC FIELDS, POLARIZATION (WAVES), ELECTRON DENSITY (CONCENTRATION), RADIO EMISSION, STATISTICAL ANALYSIS, X RAYS
DOI:
10.1086/170484
Bibliographic Code:
1991ApJ...379...80K

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 percent. The broadening is detectable out to 1/h50 Mpc. The best present estimate of the excess Faraday rotation measure varies from 100 + or - 36 rad/sq m in the central sixth of an Abell radius to 36 + or - 15 rad/sq m 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.

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