SCUBA Observations of MSX Infrared Dark Clouds

Details SCUBA Observations of MSX Infrared Dark Clouds SCUBA Observations of MSX Infrared Dark Clouds

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...193.6525c&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #65.25; Bulletin of the American Astronomical Society, Vol. 31, p.662

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present 850 and 450 μ m continuum images of 9 infrared dark clouds (IRDCs; Egan et al. 1998, ApJ, 494, L199) taken with the Submillimeter Common-User Bolometer Array (SCUBA) on the JCMT. The IRDCs appear to be very large (1-10 pc diameter) molecular cores with gas densities > 106 cm-3 and temperatures around 10 K. Approximately 5000 IRDCs have been identified in a survey of the inner Galactic Plane with the distribution of IRDCs peaking at the longitudes of spiral arm tangent points and the molecular ring. All nine clouds were detected as strong submillimeter sources with peak flux densities of 1 Jy/beam at 850 μ m. In general, the submillimeter emission follows the mid-infrared extinction and H2CO rotational line emission morphologies (Carey et al. 1998, ApJ, 508, 721). The submillimeter data reveals substructure in the IRDCs including bright 850 μ m knots. The observed H2CO line profiles are non-Gaussian suggesting the presence of molecular outflows in some of the IRDCs. It is likely that the 850 μ m emission peaks are either Class 0 protostars or pre-protostellar objects. Estimates of the dust mass and temperature will be compared to previous estimates of gas mass and temperature for IRDCs.

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