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Astron. Astrophys. 321, 311-322 (1997)

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Determination of molecular cloud parameters using thermal methanol lines

S.V. Kalenskii 1, A.M. Dzura 1, R.S. Booth 2, A. Winnberg 2 and A.V. Alakoz 3

1 Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia
2 Onsala Space Observatory, S-439 92 Onsala, Sweden
3 Moscow State University, Physical Faculty, Astronomical Department, Universitetskii pr. 13, 119899 Moscow, Russia

Received 16 February 1996 / Accepted 17 September 1996

Abstract

The [FORMULA] thermal methanol lines near 96 GHz were detected toward 12 regions of massive star formation. Together with the [FORMULA] lines observed previously, they were used to determine temperature, density, methanol abundance, and some other parameters of interest. Two methods were used to determine the same set of parameters: a simplified analytical method and statistical equilibrium calculations; the results are in satisfactory agreement with each other. The source kinetic temperatures are in the range 15-50 K, densities in the range 0.3- [FORMULA], and methanol abundance in the range [FORMULA]. Broad wings indicating high-velocity motions were detected toward a number of sources.

Key words: ISM: clouds – ISM: molecules – ISM: abundances radio lines: ISM

Send offprint requests to: A. Winnberg

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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