Parkes observations of ammonia in southern Infrared Dark Clouds

Details Parkes observations of ammonia in southern Infrared Dark Clouds Parkes observations of ammonia in southern Infrared Dark Clouds

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1632l&link_type=abstract

ATNF proposal P600, Semester: April, 2008

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Galactic, Parkes

Scientific paper

The initial conditions for high-mass star formation are still not clarified. The mid-infrared surveys of the Galactic plane revealed infrared dark clouds (IRDCs) that are candidates for representing those very early stages of massive star formation. Nevertheless, the number of well-characterised IRDCs is still minute. We have investigated southern IRDCs by mapping their dust emission and by searching for embedded sources utilising Spitzer. Still, we lack basic information about the gas properties in our IRDCs. We therefore propose to observe these with Parkes in the dense gas tracer NH3. Observations covering the (1,1) and (2,2) inversion transitions will reveal the kinetic temperature and the degree of turbulence in the IRDC gas. Spatial variations of these parameters in relation to the location of compact Spitzer sources in the clouds will be traced. Furthermore, for the first time, reliable kinematic distances can be derived. Based on these fundamental quantities, other physical parameters like luminosity and mass can be more reliably assessed. This is of special importance, since these IRDCs are part of a future guaranteed time programme for the far-infrared satellite HERSCHEL where our research group provides these objects as part of the input target sample.

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