Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..331h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 331-338. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
37
Hydroxyl Radicals, Interstellar Gas, Interstellar Magnetic Fields, Line Spectra, Molecular Clouds, Zeeman Effect, Absorption Spectra, Cassiopeia A, Centimeter Waves, Field Strength, Hydroxyl Emission
Scientific paper
Zeeman splitting of the OH absorption lines has been detected toward Ori B, W22, and Cas A. For W22, the derived magnetic field strength is -11 micro-G. For Ori B, the inferred magnetic field strength is consistent in magnitude, but not in direction, with the 38 micro-G derived previously by Crutcher and Kazes (1983, 1985); the field is positive and therefore points away from the observer. For Cas A, the average field in four velocity components is +9 micro-G, in the same direction as, but weaker than, the field strengths measured in single-dish H I data. They are considerably weaker than the field strengths in less dense H I clumps that are associated with the OH clumps. This circumstance raises serious interpretive difficulties.
Heiles Carl
Stevens Michael
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