A survey of 12-GHz methanol absorption in southern molecular clouds

Details A survey of 12-GHz methanol absorption in southern molecular clouds A survey of 12-GHz methanol absorption in southern molecular clouds

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..301p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 15, 1992, p. 301-305.

Astronomy and Astrophysics

Astronomy

20

Absorption Spectra, H Ii Regions, Methyl Alcohol, Molecular Clouds, Sky Surveys (Astronomy), Brightness Temperature, Radio Telescopes, Southern Sky

Scientific paper

A total of 58 southern molecular clouds were searched for CH3OH absorption at 12.2 GHz, yielding 38 detections. The absorption has a median brightness temperature of 0.22 K, linewidth of 4.2 km/s, and velocity offset of 2.7 km/s from the velocity of the H II region towards which the absorption occurs. Statistical methods yield an average peak optical depth of 0.21, and an associated CH3OH column density of 3 x 10 exp 15 per sq cm. The results indicate that the absorption generally arises in the cores of molecular cloud/H II region complexes.

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