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Submillimeter Observations of Dense Clumps in the Infrared Dark Cloud G049.40-00.01

Kang, Miju and Choi, Minho and Bieging, John H. and Rho, Jeonghee and Lee, Jeong-Eun and Tsai, Chao-Wei (2011) Submillimeter Observations of Dense Clumps in the Infrared Dark Cloud G049.40-00.01. Astrophysical Journal, 743 (2). p. 198. ISSN 0004-637X.

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We obtained 350 and 850 μm continuum maps of the infrared dark cloud G049.40-00.01. Twenty-one dense clumps were identified within G049.40-00.01 based on the 350 μm continuum map with an angular resolution of about 9".6. We present submillimeter continuum maps and report physical properties of the clumps. The masses of clumps range from 50 to 600 M_☉. About 70% of the clumps are associated with bright 24 μm emission sources, and they may contain protostars. The two most massive clumps show extended, enhanced 4.5 μm emission indicating vigorous star-forming activity. The clump-size-mass distribution suggests that many of them are forming high-mass stars. G049.40-00.01 contains numerous objects in various evolutionary stages of star formation, from pre-protostellar clumps to H II regions.

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Additional Information:© 2011 American Astronomical Society. Received 2011 June 11; accepted 2011 October 12; published 2011 December 6. We thank Hiroko Shinnaga and Michael Dunham for helpful discussions. M.K. and M.C. were supported by the Core Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST) of the Korean government (grant number 2011-0015816). J.-E.L. was supported by the Basic Science Research Program through NRF funded by MEST (grant number 2011-0004781). This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Caltech Submillimeter Observatory (CSO) is supported through NSF grant AST-0540882.
Funding AgencyGrant Number
National Research Foundation of Korea (NRF) Core Research Program2011-0015816
National Research Foundation of Korea (NRF) Basic Science Research Program2011-0004781
Subject Keywords:ISM: individual objects (G049.40-00.01); ISM: structure; stars: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20120202-093813139
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Official Citation:Submillimeter Observations of Dense Clumps in the Infrared Dark Cloud G049.40-00.01 Miju Kang et al. 2011 ApJ 743 198
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29087
Deposited By: Jason Perez
Deposited On:02 Feb 2012 20:59
Last Modified:03 Oct 2019 03:38

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