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12.2 GHz CH3OH Absorption in Southern Molecular Clouds

Published online by Cambridge University Press:  25 April 2016

R. Peng  and
J. B. Whiteoak
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
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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
Information
Publications of the Astronomical Society of Australia , Volume 9 , Issue 2 , 1991 , pp. 287 - 288
Copyright
Copyright © Astronomical Society of Australia 1991

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References

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