The Dust Emissivity Spectral Index in the Starless Core TMC-1C
In this paper, we present a dust emission map of the starless core TMC-1C taken at 2100 μm. Along with maps at 160, 450, 850, and 1200 μm, we study the dust emissivity spectral index from the (sub)millimeter spectral energy distribution, and find that it is close to the typically assumed value of β = 2. We also map the dust temperature and column density in TMC-1C, and find that at the position of the dust peak (A_V ~ 50) the line-of-sight-averaged temperature is ~7 K. Employing simple Monte Carlo modeling, we show that the data are consistent with a constant value for the emissivity spectral index over the whole map of TMC-1C.
Additional Information© 2010. The American Astronomical Society. Received 27 July 2009, accepted for publication 6 November 2009, Published 8 December 2009. We thank our referee, Yancy Shirley, for comments that improved the clarity of this paper. S.S. acknowledges support from the Owens Valley Radio Observatory, which is supported by the National Science Foundation through grant AST 05-40399. J.S. was partially supported by a NASA Postdoctoral Program Fellowship. Support was provided to M.E. by NASA through the Spitzer Space Telescope Fellowship Program. The JCMT is operated by the Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). The CSO is supported by the NSF fund under contract AST 02-29008.
Published - apj_708_1_127.pdf