The North American and Pelican Nebulae I. IRAC Observations

Details The North American and Pelican Nebulae I. IRAC Observations The North American and Pelican Nebulae I. IRAC Observations

2009-04-02

arxiv.org/abs/0904.0279v1

Astrophys.J.697:787-800,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

16 pages, 12 figures, ApJ In press

Scientific paper

10.1088/0004-637X/697/1/787

We present a 9 deg^2 map of the North American and Pelican Nebulae regions obtained in all four IRAC channels with the Spitzer Space Telescope. The resulting photometry is merged with that at JHKs from 2MASS 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 IR 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 towards 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.

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