Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725803g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #258.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Millimeter-emitting dust clumps in the Galactic Plane are thought to be high-density condensations within Giant Molecular Clouds and signatures of high mass star forming regions. We have observed a sample of these objects in the formaldehyde 2 and 6 cm transitions in order to precisely measure their volume densities. We present selected results from our ongoing survey. A sample of ultracompact HII regions are observed to have a variety of distinct velocity-density profiles, some of which may be indicative of infall. A degree scale map of W51 in the 2 cm formaldehyde transition suggests that this million-solar-mass GMC may be thin in one dimension (pancake-like). The survey will eventually measure densities of 1.1 mm dust clumps covering a full range of evolutionary states of the molecular gas, from pre-star-forming to evolved compact HII regions.
Bally John
Battersby Cara
Darling Jeremy
Ginsburg Adam
Zeiger Benjamin
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