The Density Structure of UCHII Regions: CS Observations

Details The Density Structure of UCHII Regions: CS Observations The Density Structure of UCHII Regions: CS Observations

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713202b&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #132.02; Bulletin of the American Astronomical Society, Vol. 33, p.716

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Ultra-compact HII (UCHII) regions are sites of massive star formation. As yet, the physical conditions inside these regions are still poorly known. Submillimeter observations offer one way of probing the gas density and temperature. As part of an extensive study of the chemistry and physical conditions inside UCHII regions, we undertook a project to map several UCHII regions in CS. CS is an abundant molecule, and is an excellent density probe. Using the Submillimeter Telescope Observatory (SMTO), we are mapping ten UCHII regions in detail at a variety of CS transitions, including the CS 5-4, 7-6 and C34S 5-4 and 7-6 lines. The regions chosen also have far-infrared data and submm data available, so we will be able to compare the dust and gas properties. We report the first results of the CS mapping program for CS 5-4 and CS 7-6 lines. We compare our conclusions with other studies of these regions. T. L. Lauwers was supported by the University of Arizona/NASA Space Grant Undergraduate Research Internship Program.

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