Zeeman Splitting in the Diffuse ISM

Details Zeeman Splitting in the Diffuse ISM Zeeman Splitting in the Diffuse ISM

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hia....15..428h&link_type=abstract

Highlights of Astronomy, Volume 15, p. 428-429

Astronomy and Astrophysics

Astronomy

Ism: Magnetic Fields, Galaxies: Magnetic Fields, Masers, Polarization

Scientific paper

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.

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