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12.2 GHz CH3OH Absorption in Southern Molecular Clouds

Published online by Cambridge University Press:  25 April 2016

R. Peng
Affiliation:
School of Physics, University of New South Wales, PO Box 1 Kensington, NSW 2033
J. B. Whiteoak
Affiliation:
CSIRO Australia Telescope National Facility, PO Box 76 Epping, NSW 2121

Abstract

We have used the Parkes 64m telescope to observe the 20 → 3−1E absorption of CH3 OH at 12.2 GHz towards 58 Galactic H II regions and dark clouds, yielding 38 detections. The results show that CH3 OH absorbing clouds have a typical optical depth of 0.25 and a column density of 8.4 × 1015 cm−2. CH3 OH absorption is often accompanied by unsaturated maser emission and is closely associated with background H II regions. CH3 OH absorption against the 2.7 K background is also observed in several dark clouds.

Type
Galactic and Stellar
Copyright
Copyright © Astronomical Society of Australia 1991

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References

Gardner, F. F. and Whiteoak, J.B., 1984, Mon. Not. R. Astr. Soc., 210, 23.CrossRefGoogle Scholar
Wadiak, E. J., 1986, Ph.D. Thesis, University of Virginia.Google Scholar
Whiteoak, J. B, Gardner, F. F., et al., 1988, Mon. Not. R. Astr. Soc., 235, 655.CrossRefGoogle Scholar
Whiteoak, J. B and Peng, R. S, 1989, Mon. Not. R. Astr. Soc., 239, 677.CrossRefGoogle Scholar
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