Class II maser candidates in substituted methanol: CH_3OD, ^13CH_3OH, CH_3 ^18OH and CH_3SH

Details Class II maser candidates in substituted methanol: CH_3OD, ^13CH_3OH, CH_3 ^18OH and CH_3SH Class II maser candidates in substituted methanol: CH_3OD, ^13CH_3OH, CH_3 ^18OH and CH_3SH

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..999j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 4, pp. 999-1005.

Astronomy and Astrophysics

Astronomy

Masers, Stars: Formation, Ism: Abundances, Ism: Molecules, Radio Lines: Ism

Scientific paper

We investigate the possibility of interstellar masers in transitions of the methanol isotopomers CH_3OD, ^13CH_3OH and CH_3^18OH, and of CH_3SH. The model used, in which masers are pumped through the first and second torsionally excited states by IR radiation, has accounted successfully for the Class II masers in main species methanol, ^12CH_3^16OH. Several potential maser candidates are identified for CH_3OD, their detectability depending on the enrichment of this species in star-forming regions. In ^13CH_3OH and CH_3^18OH the best maser candidates are direct counterparts of the well-known 6.7- and 12.2-GHz methanol masers, but the lower interstellar abundance of these substituted species means that the expected brightness is greatly reduced. The maser candidates in CH_3SH are also weak. By comparing these species we find that the large b-component of the dipole moment in methanol plays a significant role in its propensity to form masers, as does the strong torsion-rotation interaction due to the light hydroxyl frame. Thus the exceptional brightness of interstellar methanol masers is due to a favourable combination of molecular properties as well as high interstellar abundance.

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