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Zeeman Splitting in the Diffuse ISM

Published online by Cambridge University Press:  21 October 2010

Carl Heiles
Carl Heiles*
Affiliation:
Astronomy Department, University of California, Berkeley CA 94720-3422, USA email: heiles@astro.berkeley.edu
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Abstract

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Many Zeeman-spitting measurements in the diffuse Galactic Interstellar Medium have been made of the 21-cm line in both absorption and emission. Typical field strength is about 6 μG, with enhancement in shocked regions; the magnetic, turbulent, and cosmic-ray pressures are comparable and considerably larger than the thermal gas pressure. For PhotoDissociation Regions, Carbon recombination lines show intriguing results for single-dish measurements. OH Megamasers in Ultra-Luminous Infrared Galaxies show easily detectable fields whose strength ranges up to at least 20 mG. Upper limits for several damped Ly-α systems range down to a few μG. The z=0.692 system against 3C286 was reported in the literature to have a large field strength, but this result is wrong.

Keywords

ISM: magnetic fieldsgalaxies: magnetic fieldsmaserspolarization
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 428 - 429
Copyright
Copyright © International Astronomical Union 2010

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