Magnetic field strengths in molecular clouds

Details Magnetic field strengths in molecular clouds Magnetic field strengths in molecular clouds

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...181..119c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 181, no. 1, July 1987, p. 119-126.

Astronomy and Astrophysics

Astrophysics

43

Interstellar Magnetic Fields, Magnetic Flux, Molecular Clouds, Radio Spectra, Star Formation, Absorption Spectra, Hydroxyl Radicals, Interstellar Gas, Line Spectra, Zeeman Effect

Scientific paper

The authors report additional observations made with the Nançay radio telescope of the Zeeman effect in the 1665 and 1667 MHz absorption lines of OH toward four molecular cloud positions. Magnetic fields determined from these data for each cloud are: S88 B, +69±5 μG; W49 B, +21±5 μG; W40, -14.0±2.6 μG; W22 B, -32±9 μG. The authors present as a working hypothesis the suggestion that in cool dust clouds and in warm molecular clouds the total magnetic field strengths are of order 30 and 120 μG, respectively. These detections of the OH Zeeman effect add to a growing body of evidence that magnetic field strengths increase with density in interstellar clouds and that magnetic fields are sufficiently strong to be important in the evolution of dense clouds and in the star formation process.

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