Mathematics – Probability
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cokon.103...75s&link_type=abstract
Communications of the Konkoly Observatory, Hungary Proceedings of the conference: 'The interaction of stars with their environme
Mathematics
Probability
1
Scientific paper
We present SEST observations of G345.01+1.79 in maser and `quasi-thermal' lines of CH3OH, lines of SiO, CS and some other shock tracing molecules. For the first time weak methanol maser emission was detected at frequencies 165.05 and 165.06 GHz. The observed `quasi-thermal' CH3OH and SiO (2-1) lines display pronounced blue wings confined to the G345.01+1.79(S) position. Velocities of CH3OH and OH maser features lie well within the wing. So, there is a high probability that interaction of the wind from the young star with ambient material is responsible for the creation of masers and production of the blue non-gaussian wing. Comparison of velocities for `quasi-thermal' and maser lines shows that the bow shock velocity relative to the bulk of cloud material is about 10 kms-1. So, most probably we are dealing with the first clear example of an ultracompact HII region moving through a molecular cloud. Modelling of CH3OH `quasi-thermal' emission and consideration of maser profiles shows that the cloud material is greatly inhomogeneous.
Cragg Dinah M.
Ellingsen Simon P.
Godfrey Peter D.
Harjunpää P.
Kalinina N. D.
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