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The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with IRAC

Porras, Alicia and Jorgensen, Jes K. and Allen, Lori E. and Evans, Neal J. and Bourke, Tyler L. and Alcala, Juan M. and Dunham, Michael M. and Blake, Geoffrey A. and Chapman, Nicholas and Cieza, Lucas and Harvey, Paul M. and Huard, Tracy L. and Koerner, David W. and Mundy, Lee G. and Myers, Philip C. and Padgett, Deborah L. and Sargent, Anneila I. and Stapelfeldt, Karl R. and Teuben, Peter and van Dishoeck, Ewine F. and Wahhaj, Zahed and Young, Kaisa E. (2007) The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with IRAC. Astrophysical Journal, 656 (1). pp. 493-504. ISSN 1538-4357


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Publisher’s or external URL: http://dx.doi.org/10.1086/510422


We present IRAC (3.6, 4.5, 5.8, and 8.0 mu m) observations of the Chamaeleon II molecular cloud. The observed area covers about 1 deg(2) defined by A(V) > 2. Analysis of the data in the 2005 c2d catalogs reveals a small number of sources ( 40) with properties similar to those of young stellar or substellar objects (YSOs). The surface density of these YSO candidates is low, and contamination by background galaxies appears to be substantial, especially for sources classified as Class I or flat spectral energy distribution ( SED). We discuss this problem in some detail and conclude that very few of the candidate YSOs in early evolutionary stages are actually in the Cha II cloud. Using a refined set of criteria, we define a smaller, but more reliable, set of 24 YSO candidates.

Item Type: Article
Publisher’s Statement: © 2007 The American Astronomical Society. Published by IOP Publishing.
ID number or DOI: 10.1086/510422
Keywords: array camera irac; brown dwarf; dark-cloud; dense cores; herbig-haro objects; hh 54; molecular clouds; space-telescope; star-formation; stars : formation; stars : low-mass, brown dwarfs; young stellar cluster
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 30 Sep 2015 17:43
URI: http://openknowledge.nau.edu/id/eprint/419

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