Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4202r&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #42.02; Bulletin of the American Astronomical Society, Vol. 34, p.1167
Astronomy and Astrophysics
Astronomy
Scientific paper
Analysis of rotation measure distributions in cluster radio galaxies shows that much of the rotation measure can originate from the individual radio source and its immediate environs. This result was obtained by comparing source polarization position angles to the observed rotation measures. Unless one can eliminate the individual source RM contributions, which is not possible at present, then only an upper limit to the strength of cluster-wide magnetic field fluctuations can be made. Using the same model-dependent assumptions as in the literature, we derive an upper limit of approximately 0.4 microGauss for fluctuating magnetic fields on scales of 0.5 - 3 kpc in the general Centaurus Cluster medium. Source-related Faraday rotation can arise either from a low density thermal medium mixed with the radio galaxy, or a higher density `skin' around the relativistic plasma. This research was supported by NSF grant AST-00-71167 at Minnesota (LR) and by a University Research Fellowship from the Royal Society (KMB).
Blundell Katherine
Rudnick Lawrence
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