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The Astrophysical Journal Volume 680 Number 1 Create an alert RSS this journal

Paul M. Harvey et al. 2008 ApJ 680 495 doi:10.1086/587687

The Spitzer Survey of Interstellar Clouds in the Gould Belt. I. IC 5146 Observed With IRAC and MIPS

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Paul M. Harvey1, Tracy L. Huard2, Jes K. Jørgensen3, Robert A. Gutermuth2, Eric E. Mamajek2, Tyler L. Bourke2, Bruno Merín4, Lucas Cieza1, Tim Brooke5, Nicholas Chapman6, Juan M. Alcalá7, Lori E. Allen2, Neal J. Evans II1, James Di Francesco8 and Jason M. Kirk9

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Abstract References Cited By
We present observations of two areas totalling 0.57 deg2 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.

Subject headings

infrared: general; stars: formation


Dates

Issue 1 (2008 June 10)

Received 2007 December 21, accepted for publication 2008 February 18



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