The Molecular Environment of Methanol Masers

Details The Molecular Environment of Methanol Masers The Molecular Environment of Methanol Masers

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2205p&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #22.05; Bulletin of the American Astronomical Society, Vol. 24, p.1157

Other

1

Scientific paper

We have conducted an interferometric study of the 95 GHz 8_0 -> 7_1 A(+) transition of methanol (CH_3OH). This line is known to show maser action in so-called Class I methanol maser sources, i.e. star-forming regions in which methanol masers are found offset by up to 1 pc from ultracompact HII regions, compact infrared sources, and OH and H_2O masers. The powering sources of these masers are unknown and obtaining accurate maser positions to allow comparison with other phenomena was one major goal of our observations, which were conducted with a resolution of a few arcseconds. We used the Berkeley-Illinois-Maryland Array (BIMA) to map the CH_3OH emission toward the dense molecular cloud core associated with the ultracompact HII regions W51 e1/e2. Maser emission in the CH3OH line is found to arise from a position that is offset by ~ 40'' (= 1.3 pc) from the e1/e2 continuum sources and known H_2O and OH masers. In contrast, (quasi-)thermal methanol emission is observed from the hot dense molecular material surrounding e1/e2. To obtain information of the distribution of the methanol maser emission relative to its molecular environment, we simultaneously observed the J=2->1 line of CS, a tracer for dense (n > 10(5) cm(-3) ) gas. We do not detect CS toward the maser position, excluding the possibility that the maser has an associated dense core, but find strong CS emission around e1/e2 with an extent much larger than that of the CH_3OH.

Affiliated with

Also associated with

No associations

Rating

The Molecular Environment of Methanol Masers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Molecular Environment of Methanol Masers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Molecular Environment of Methanol Masers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1110447