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The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. IX. The Serpens YSO Population as Observed with IRAC and MIPS

Harvey, Paul and Merín, Bruno and Huard, Tracy L. and Rebull, Luisa M. and Chapman, Nicholas and Evans, Neal J., II and Myers, Philip C. (2007) The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. IX. The Serpens YSO Population as Observed with IRAC and MIPS. Astrophysical Journal, 663 (2). pp. 1149-1173. ISSN 0004-637X.

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We discuss the combined IRAC/MIPS c2d Spitzer Legacy observations of the Serpens star-forming region. We describe criteria for isolating bona fide YSOs from the extensive background of extragalactic objects. We then discuss the properties of the resulting high-confidence set of 235 YSOs. An additional 51 lower confidence YSOs outside this area are identified from the MIPS data and 2MASS photometry. We present color-color diagrams to compare our observed source properties with those of theoretical models for star/disk/envelope systems and our own modeling of the objects that are well represented by a stellar photosphere plus circumstellar disk. These objects exhibit a wide range of disk properties, from many with actively accreting disks to some with both passive disks and even possibly debris disks. The YSO luminosity function extends down to at least a few times 10^(-3) L_☉ or lower. The lower limit may be set more by our inability to distinguish YSOs from extragalactic sources than by the lack of YSOs at very low luminosities. We find no evidence for variability in the shorter IRAC bands between the two epochs of our data set, Δt ~ 6 hr. A spatial clustering analysis shows that the nominally less evolved YSOs are more highly clustered than the later stages. The background extragalactic population can be fitted by the same two-point correlation function as seen in other extragalactic studies. We present a table of matches between several previous infrared and X-ray studies of the Serpens YSO population and our Spitzer data set. The clusters in Serpens have a very high surface density of YSOs, primarily with SEDs suggesting extreme youth. The total number of YSOs, mostly Class II, is greater outside the clusters.

Item Type:Article
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URLURL TypeDescription
Rebull, Luisa M.0000-0001-6381-515X
Evans, Neal J., II0000-0001-5175-1777
Additional Information:© 2007 American Astronomical Society. Received 2007 January 29; accepted 2007 April 1. Support for this work, part of the Spitzer Legacy Science Program, was provided by NASA through contracts 1224608, 1230782, and 1230779 issued by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Astrochemistry in Leiden is supported by an NWO Spinoza grant and a NOVA grant. B. M. thanks the Fundacio´n Ramo´n Areces for financial support. 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 extensive use of the SIMBAD database.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Fundaciόn Ramόn ArecesUNSPECIFIED
Subject Keywords:infrared: general
Issue or Number:2
Record Number:CaltechAUTHORS:20100423-094508648
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Official Citation:Paul Harvey et al 2007 ApJ 663 1149 doi: 10.1086/518646
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18053
Deposited By: Jason Perez
Deposited On:23 Apr 2010 20:33
Last Modified:09 Dec 2019 21:35

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