SMA Observations of IRDC Cores: An Active Hot Core and a Quiescent Cold Core

Details SMA Observations of IRDC Cores: An Active Hot Core and a Quiescent Cold Core SMA Observations of IRDC Cores: An Active Hot Core and a Quiescent Cold Core

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913302j&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #133.02; Bulletin of the American Astronomical Society,

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Scientific paper

Infrared Dark Clouds are a distinct class of interstellar gas cloud identified as dark extinction features seen in silhouette against the bright Galactic background at mid-IR wavelengths. Our recent 1.2 mm continuum emission survey of IRDCs reveal many compact (< 0.5 pc) and massive (10 to 2100 M&sun;) cores within them. These pre-stellar cores hold the key to understanding IRDCs and their role in star formation. About 1/3 of these cores show evidence for active star-formation; shocked gas, outflows, and embedded protostars. The remaining 2/3 of these cores show no signs of active star formation and may be massive starless cores. Here we present recent high angular resolution molecular line maps and sub-mm continuum images obtained with the SMA Interferometer toward two of the most massive cores; one activley forming stars and the other more quiescent. These images elucidate their subparsec structure, and reveal whether the cores are likely to produce a single high-mass star, or a cluster of lower-mass stars. Toward the active core we see many molecular lines indicating that this is a hot molecular core, in an early stage in the formation of a high-mass protostar.

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