Schnee, Scott and Enoch, Melissa and Johnstone, Doug and Culverhouse, Thomas and Leitch, Erik and Marrone, Daniel P. and Sargent, Anneila (2010) An Observed Lack of Substructure in Starless Cores. Astrophysical Journal, 718 (1). pp. 306-313. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100817-140251955
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In this paper, we present the results of a high resolution (5'') Combined Array for Research in Millimeter-wave Astronomy and Sunyaev-Zeldovich Array survey of the 3 mm continuum emission from 11 of the brightest (at 1.1 mm) starless cores in the Perseus molecular cloud. We detect 2 of the 11 cores, both of which are composed of single structures, and the median 3σ upper limit for the non-detections is 0.2 M_⊙ in a ~5'' beam. These results are consistent with, and as stringent as, the low detection rate of compact 3 mm continuum emission in dense cores in Perseus reported by Olmi et al. From the non-detection of multiple components in any of the 11 cores, we conclude that starless core mass functions derived from bolometer maps at resolutions range 10''-30'' (e.g., with MAMBO, SCUBA, or Bolocam) are unlikely to be significantly biased by the blending of lower mass cores with small separations. These observations provide additional evidence that the majority of starless cores in Perseus have inner density profiles shallower than r^( –2).
|Additional Information:||© 2010 The American Astronomical Society. Received 2010 March 12; accepted 2010 May 26; published 2010 June 29. We thank John Carpenter, James Di Francesco, Brenda Matthews, and Sarah Sadavoy for helpful discussions. S.S. acknowledges support from a Plaskett Fellowship at the Herzberg Institute of Astrophysics. Support was provided to M.E. by NASA through the Spitzer Space Telescope Fellowship Program. D.J. is supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grant. Support for D.M. was provided by NASA through Hubble Fellowship grant HF-51259.01-A. We thank the CARMA staff, students, and postdocs for their help in making these observations. Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the Associates of the California Institute of Technology, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement and by the CARMA partner universities. 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. The CSO is supported by the NSF fund under contract AST 02-29008.|
|Subject Keywords:||dust, extinction; stars: formation|
|Classification Code:||PACS: 98.38.Cp; 95.85.Bh; 97.21.+a; 98.38.Dq|
|Official Citation:||Scott Schnee et al 2010 ApJ 718 306 doi: 10.1088/0004-637X/718/1/306|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||17 Aug 2010 21:53|
|Last Modified:||26 Dec 2012 12:19|
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