Detection of the OH Zeeman effect toward Orion A

Details Detection of the OH Zeeman effect toward Orion A Detection of the OH Zeeman effect toward Orion A

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304l..57t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 304, May 15, 1986, p. L57-L60.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Hydroxyl Radicals, Interstellar Magnetic Fields, Zeeman Effect, Absorption Spectra, Centimeter Waves, Field Strength, Molecular Gases, Orion Nebula

Scientific paper

The Zeeman effect in the 18 cm OH absorption spectrum of Orion A is detected. From this effect, a line-of-sight magnetic field strength of - 125 + or - 20 is derived. At the same position, an H I Zeeman effect equivalent to a magnetic field of - 49 + or - 4 micro-G is found. Thus, the magnetic field in the molecular gas toward Orion A is significantly stronger than that in the atomic gas, contrary to the recent determination for the Cas A line of sight. Densities in the atomic and molecular regions toward Orion A are estimated and it is found that for this region the data are consistent with B proportional to n exp kappa, kappa = 0.3.

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