A Survey of Magnetic Field Strengths in the Envelopes of Molecular Clouds via the 18 cm OH Zeeman Effect
We present the results of an extensive Arecibo observational survey of magnetic field strengths in the inter-core regions of molecular clouds to determine their role in the evolution and collapse of molecular clouds as a whole. Sensitive 18 cm OH Zeeman observations of absorption lines from Galactic...
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Published in | The Astrophysical journal Vol. 884; no. 1; pp. 49 - 53 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Philadelphia
The American Astronomical Society
10.10.2019
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | We present the results of an extensive Arecibo observational survey of magnetic field strengths in the inter-core regions of molecular clouds to determine their role in the evolution and collapse of molecular clouds as a whole. Sensitive 18 cm OH Zeeman observations of absorption lines from Galactic molecular gas in the direction of extragalactic continuum sources yielded 38 independent measurements of magnetic field strengths. Zeeman detections were achieved at the 3 level toward nine clouds, while the others revealed sensitive upper limits to the magnetic field strength. Our results suggest that total field strengths in the inter-core regions of giant molecular clouds (GMCs) are about 15 G. |
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Bibliography: | AAS18770 Interstellar Matter and the Local Universe |
ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/1538-4357/ab364e |