Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19913416b&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #134.16; Bulletin of the American Astronomical Society, Vol. 33, p.1504
Other
Scientific paper
We present VLBA results of 12.2 GHz class II methanol maser observations towards nine massive star forming regions in the Northern Hemisphere. Our results show that 7 out of 9 of the imaged target regions display linear or curved morphologies with smooth velocity gradients. However, sub-solar enclosed masses are derived when using the edge-on circumstellar disk model. Although there are arguments that suggest only a small portion of the edge-on disk is seen, we feel that the edge-on circumstellar disk model for explaining the morphologies of methanol masers is inadequate and cannot explain methanol maser regions with complex and simple morphologies. We will present the results of our observations as well as other possible interpretations of the morphologies of methanol maser regions. This research has been supported by the National Science Foundation, through its Research Experience for Undergraduates program. NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Beasley Anthony J.
Boley Aaron C.
Claussen Mark J.
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