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The Mass Distribution of Starless and Protostellar Cores in Gould Belt Clouds

Sadavoy, Sarah I. and Di Francesco, James and Bontemps, Sylvain and Megeath, S. Thomas and Rebull, Luisa M. and Allgaier, Erin and Carey, Sean and Gutermuth, Robert and Hora, Joe and Huard, Tracy and McCabe, Caer-Eve and Muzerolle, James and Noriega-Crespo, Alberto and Padgett, Deborah and Terebey, Susan (2010) The Mass Distribution of Starless and Protostellar Cores in Gould Belt Clouds. Astrophysical Journal, 710 (2). pp. 1247-1270. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20100225-094328006

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Abstract

Using data from the SCUBA Legacy Catalogue (850 μm) and Spitzer Space Telescope (3.6-70 μm), we explore dense cores in the Ophiuchus, Taurus, Perseus, Serpens, and Orion molecular clouds. We develop a new method to discriminate submillimeter cores found by Submillimeter Common-User Bolometer Array (SCUBA) as starless or protostellar, using point source photometry from Spitzer wide field surveys. First, we identify infrared sources with red colors associated with embedded young stellar objects (YSOs). Second, we compare the positions of these YSO candidates to our submillimeter cores. With these identifications, we construct new, self-consistent starless and protostellar core mass functions (CMFs) for the five clouds. We find best-fit slopes to the high-mass end of the CMFs of –1.26 ± 0.20, –1.22 ± 0.06, –0.95 ± 0.20, and –1.67 ± 0.72 for Ophiuchus, Taurus, Perseus, and Orion, respectively. Broadly, these slopes are each consistent with the –1.35 power-law slope of the Salpeter initial mass function at higher masses, but suggest some differences. We examine a variety of trends between these CMF shapes and their parent cloud properties, potentially finding a correlation between the high-mass slope and core temperature. We also find a trend between core mass and effective size, but we are very limited by sensitivity. We make similar comparisons between core mass and size with visual extinction (for A_V ≥ 3) and find no obvious trends. We also predict the numbers and mass distributions of cores that future surveys with SCUBA-2 may detect in each of these clouds.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/710/2/1247DOIArticle
http://www.iop.org/EJ/abstract/0004-637X/710/2/1247/PublisherArticle
ORCID:
AuthorORCID
Megeath, S. Thomas0000-0001-7629-3573
Rebull, Luisa M.0000-0001-6381-515X
Carey, Sean0000-0002-0221-6871
Padgett, Deborah0000-0001-5334-5107
Additional Information:© 2010 American Astronomical Society. Print publication: Issue 2 (2010 February 20); received 2009 October 28; accepted for publication 2010 January 6; published 2010 January 28. This work was possible with funding from a Natural Sciences and Engineering Research Council of Canada CGS award and a Discovery Grant. The authors thank the anonymous referee for their comments and suggestions toward this paper. The authors also thank the Taurus Spitzer Team and the Orion Spitzer Team for contributing infrared data prior to publication. S.I.S. thanks J. Jørgensen and M. Enoch for their kind time and attention to various inquiries. As well, the authors thank E. Ledwosinska, T. MacKenzie, H. Kirk, and D. Johnstone for their work in creating the SLC and N. Evans II, P. Harvey, M. Dunham, T. Huard, T. Brooke, M. Enoch, N. Chapman, L. Cieza, and K. Stapelfeldt for their work in creating the c2d catalog. The James ClerkMaxwell Telescope is operated by The Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada. 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. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords:dust, extinction; ISM: clouds; stars: formation; stars: luminosity function, mass function; stars: protostars
Issue or Number:2
Record Number:CaltechAUTHORS:20100225-094328006
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100225-094328006
Official Citation:The Mass Distribution of Starless and Protostellar Cores in Gould Belt Clouds Sarah I. Sadavoy, James Di Francesco, Sylvain Bontemps, S. Thomas Megeath, Luisa M. Rebull, Erin Allgaier, Sean Carey, Robert Gutermuth, Joe Hora, Tracy Huard, Caer-Eve McCabe, James Muzerolle, Alberto Noriega-Crespo, Deborah Padgett, and Susan Terebey 2010 ApJ 710 1247-1270 doi: 10.1088/0004-637X/710/2/1247
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17593
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:25 Feb 2010 19:04
Last Modified:28 Nov 2017 03:20

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