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The Spitzer survey of interstellar clouds in the Gould Belt. I. IC 5146 observed with IRAC and MIPS

Harvey, Paul M. and Huard, Tracy L. and Jørgensen, Jes K. and Gutermuth, Robert A. and Mamajek, Eric E. and Bourke, Tyler L. and Merín, Bruno and Cieza, Lucas and Brooke, Timothy Y. and Chapman, Nicholas and Alcalá, Juan M. and Allen, Lori E. and Evans, Neal J., II and di Francesco, James and Kirk, Jason M. (2008) The Spitzer survey of interstellar clouds in the Gould Belt. I. IC 5146 observed with IRAC and MIPS. Astrophysical Journal, 680 (1). pp. 495-516. ISSN 0004-637X.

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We present observations of two areas totalling 0.57 deg^2 in the IC 5146 star-forming region at 3.6, 4.5, 5.8, 8.0, 24, and 70 μm observed with the Spitzer Space Telescope. We reexamine the issue of the distance to this cloud and conclude a value of 950 ± 80 pc is most likely. We compare source counts, colors, and magnitudes in our observed region to a subset of the SWIRE data that was processed through our pipeline. We identify more than 200 young stellar object (YSO) candidates from color-magnitude and color-color diagrams, many of which were previously unknown. We compare the colors of these YSOs to the models of Robitaille et al. and perform simple fits to the SED's to estimate properties of the circumstellar disks likely to surround the Class II and III sources. We also compare the mid-IR disk excesses to Hα emission-line data where available. We present a quantitative description of the degree of clustering, estimate the star formation efficiency, and discuss the fraction of YSOs in the region with disks relative to an estimate of the diskless YSO population. Finally, we compare the YSO distribution to the cold dust distribution mapped by SCUBA and briefly describe the diffuse emission likely due to PAHs associated with the H II region.

Item Type:Article
Related URLs:
URLURL TypeDescription
Jørgensen, Jes K.0000-0001-9133-8047
Gutermuth, Robert A.0000-0002-6447-899X
Mamajek, Eric E.0000-0003-2008-1488
Cieza, Lucas0000-0002-2828-1153
Evans, Neal J., II0000-0001-5175-1777
Additional Information:© 2008 The American Astronomical Society. Received 2007 December 21; accepted 2008 February 18. Print publication: Issue 1 (2008 June 10). Support for this work, part of the Spitzer Legacy Science Program in the GO3 call, was provided by NASA through contract 1288664 issued by the Jet Propulsion Laboratory, California Institute of Technology. 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 NASA and the National Science Foundation. We also acknowledge use of the SIMBAD database. E. E. M. is supported through a Clay Postdoctoral Fellowship from the Smithsonian Astrophysical Observatory.
Funding AgencyGrant Number
Smithsonian Astrophysical ObservatoryUNSPECIFIED
Subject Keywords:infrared: general; stars: formation
Issue or Number:1
Record Number:CaltechAUTHORS:20090504-145959388
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14153
Deposited By: Tony Diaz
Deposited On:17 Aug 2009 18:24
Last Modified:09 Mar 2020 13:18

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