Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..677w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 677-685.
Astronomy and Astrophysics
Astronomy
14
Absorption Spectra, Methyl Alcohol, Molecular Clouds, Radio Astronomy, Mass Distribution, Molecular Energy Levels, Molecular Spectra, Spatial Distribution
Scientific paper
The Parkes 64-m antenna has been used to map the 12.2-GHz 2(0)-3(-1) transition of CH3OH across the dense molecular cloud G1.6-0.025 located in the central region of the Galaxy. Well-defined line absorption with a maximum brightness temperature of 2.0 K is extended over a region of dimensions 18 x 12 arcmin; the velocity varies systematically from 45 to 75 km/s. Because there is little 12-GHz continuum emission towards the cloud, the absorption must be primarily against the microwave background, and probably represents the best evidence for population 'antiinversion' in CH3OH transitions. For a transition temperature of 0.5 K and a cloud temperature of 10 K the maximum column density is 2 x 10 to the 16th/sq cm. Superimposed on the cloud distribution are two 5-arcmin regions with higher velocities of 105 and 165 km/s. Both the cloud and 165 km/s clump have also been detected in studies of other molecules.
Peng R. S.
Whiteoak John B.
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