ATCA Imaging of Dense Gas in Star-Forming Environments

Details ATCA Imaging of Dense Gas in Star-Forming Environments ATCA Imaging of Dense Gas in Star-Forming Environments

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1717w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.17; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The HCN (J=1-0) line is the primary indicator of dense (105 cm-3) molecular gas for extragalactic studies. However, the reliability of HCN as a tracer of dense gas mass has been questioned, given the possibility of abundance variations or mid-IR pumping. Alternatively, HCO+ has been proposed as a superior tracer of dense gas, although it may be enhanced along with ionized carbon in the presence of strong radiation fields. To investigate the variation in the HCN/HCO+ ratio across different environments, we have performed high-resolution simultaneous imaging in HCN and HCO+ of a circumnuclear starburst lacking nuclear activity (NGC 7552) and an HII region within the Large Magellanic Cloud (N113) using the upgraded Australia Telescope Compact Array. Variations in the HCN/HCO+ ratio as a function of spatial scale and IR emission brightness are discussed.
This research was supported by an ARC/CSIRO Linkage Grant and the U. of Illinois.

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