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The North American and Pelican Nebulae. I. IRAC Observations

Guieu, S. and Rebull, L. M. and Stauffer, J. R. and Hillenbrand, L. A. and Carpenter, J. M. and Noriega-Crespo, A. and Padgett, D. L. and Cole, D. M. and Carey, S. J. and Stapelfeldt, K. R. and Strom, S. E. (2009) The North American and Pelican Nebulae. I. IRAC Observations. Astrophysical Journal, 697 (1). pp. 787-800. ISSN 0004-637X.

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We present a 9 deg^2 map of the North American and Pelican Nebulae regions obtained in all four Infrared Array Camera (IRAC) channels with the Spitzer Space Telescope. The resulting photometry is merged with that at JHK_s from Two Micron All Sky Survey and a more spatially limited BVI survey from previous ground-based work. We use a mixture of color-color diagrams to select a minimally contaminated set of more than 1600 objects that we claim are young stellar objects (YSOs) associated with the star-forming region. Because our selection technique uses infrared excess as a requirement, our sample is strongly biased against inclusion of Class III YSOs. The distribution of IRAC spectral slopes for our YSOs indicates that most of these objects are Class II, with a peak toward steeper spectral slopes but a substantial contribution from a tail of Flat spectrum and Class I type objects. By studying the small fraction of the sample that is optically visible, we infer a typical age of a few Myr for the low-mass population. The young stars are clustered, with about a third of them located in eight clusters that are located within or near the LDN 935 dark cloud. Half of the YSOs are located in regions with surface densities higher than 1000 YSOs/deg^2. The Class I objects are more clustered than the Class II stars.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rebull, L. M.0000-0001-6381-515X
Stauffer, J. R.0000-0003-3595-7382
Carpenter, J. M.0000-0003-2251-0602
Noriega-Crespo, A.0000-0002-6296-8960
Padgett, D. L.0000-0001-5334-5107
Carey, S. J.0000-0002-0221-6871
Stapelfeldt, K. R.0000-0002-2805-7338
Additional Information:© 2009. The American Astronomical Society. Received 25 November 2008, accepted for publication 4 March 2009, Published 5 May 2009. 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. Support for this work was provided by NASA through an award issued by JPL/Caltech. This research has made use of NASA's Astrophysics Data System (ADS) Abstract Service, and the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. These data were served by the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the Digitized Sky Surveys, which were produced at the Space Telescope Science Institute under US Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions. The research described in this paper was partially carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:circumstellar matter, infrared: ISM, infrared: stars, ISM: clouds, ISM: individual: NGC 7000 IC 5070, stars: formation, stars: pre-main sequence
Issue or Number:1
Record Number:CaltechAUTHORS:20150817-124812207
Persistent URL:
Official Citation:S. Guieu et al. 2009 ApJ 697 787 doi:10.1088/0004-637X/697/1/787
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59637
Deposited By: Luisa Rebull
Deposited On:19 Aug 2015 17:26
Last Modified:31 Oct 2019 01:54

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