Anti-inversion of the 12.1 GHz methanol line towards dark clouds

Details Anti-inversion of the 12.1 GHz methanol line towards dark clouds Anti-inversion of the 12.1 GHz methanol line towards dark clouds

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197..271w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 271-273.

Astronomy and Astrophysics

Astrophysics

40

Interstellar Masers, Line Spectra, Methyl Alcohol, Molecular Clouds, Radio Spectra, Background Radiation, Continuous Radiation, H Ii Regions

Scientific paper

The authors have used the NRAO 140 foot telescope to observe the 20→3-1E (12.1 GHz) transition of CH3OH towards three dense molecular cloud cores embedded in nearby dark clouds.The line was detected in absorption towards TMC 1 and L 183. The excitation temperature of this line in such regions is thus less than the temperature of the microwave background (2.7K). It is shown that this result is consistent with statistical equilibrium calculations based upon collisional excitation and radiative decay. The inversion of this transition towards compact H II regions is likely to be a consequence of radiative pumping.

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