The structure of methanol radio sources in star-forming regions from observations at 44 and 95 GHz

Details The structure of methanol radio sources in star-forming regions from observations at 44 and 95 GHz The structure of methanol radio sources in star-forming regions from observations at 44 and 95 GHz

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..524k&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 524

Astronomy and Astrophysics

Astronomy

3

Radio Sources (Astronomy), Methyl Alcohol, Star Formation, Molecular Clouds, Gas Density, Cosmic Dust, High Speed, Astronomical Models

Scientific paper

A simple analytical model for excitation of methanol is developed. It is shown that Class I methanol sources may occur near the boundaries of dense gas-dust clouds. Masres at the transition 8(0)-7(1)A(+) of comparable intensity with masers at the transition 7(0)-6(1)A(+) are possible only when the kinetic temperature is no less than 30 K. Cavities formed by high-velocity streams facilitate the occurrence of masers; it is possible that this is one of the reasons for the link between methanol masers and high-velocity flows of material. It is possible that the radiation field close to young stars 'moves aside' Class I masers to some distance from the stars.

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