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S.L. Schnee, A.A. Goodman (Harvard-Smithsonian, CfA)
We present the results of observations of the starless core TMC-1C. High quality SCUBA continuum maps at 450 and 850 microns yield temperature and column density maps. The densest portions of the cloud are as cold as ~7 K, and the outer envelope has a temperature of ~15 K, which are typical values for starless cores in Taurus. Molecular line maps of several tracers corresponding to various optical depths made with the IRAM 30 meter telescope and FCRAO 14 meter telescope have comparable sensitivity to the SCUBA observations with somewhat coarser angular resolution. The line maps give kinematic data and allow for an analysis of the depletion of gas onto dust particles. Because every tracer is self-absorbed in the high-density regions of the core, we are able to look for evidence of inward and outward motions. Velocity gradient maps clearly show that the different peaks in the SCUBA column density maps must be treated as kinematically distinct, and that the outer envelopes of these cores move in qualitatively different way than their inner, denser regions. We explore the evidence for solid body or differential rotation and describe the effects of spatial resolution on the measured velocity gradients.
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The author(s) of this abstract have provided an email address for comments about the abstract: sschnee@cfa.harvard.edu
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.