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Title: THE NORTH AMERICAN AND PELICAN NEBULAE. I. IRAC OBSERVATIONS

Abstract

We present a 9 deg{sup 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{sub 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. Halfmore » of the YSOs are located in regions with surface densities higher than 1000 YSOs/deg{sup 2}. The Class I objects are more clustered than the Class II stars.« less

Authors:
; ; ; ; ;  [1]; ;  [2]; ;  [3]
  1. Spitzer Science Center/Caltech, M/S 220-6, 1200 E. California Blvd., Pasadena, CA 91125 (United States)
  2. Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)
  3. Jet Propulsion Laboratory, MS 183-900, California Institute of Technology, Pasadena, CA 91109 (United States)
Publication Date:
OSTI Identifier:
21300530
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 697; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/697/1/787; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COLOR; MASS; MATTER; NEBULAE; PHOTOMETRY; STARS; TELESCOPES

Citation Formats

Guieu, S, Rebull, L M, Stauffer, J R, Noriega-Crespo, A, Padgett, D L, Carey, S J, Hillenbrand, L A, Carpenter, J M, Cole, D M, Stapelfeldt, K R, and Strom, S. E. THE NORTH AMERICAN AND PELICAN NEBULAE. I. IRAC OBSERVATIONS. United States: N. p., 2009. Web. doi:10.1088/0004-637X/697/1/787; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Guieu, S, Rebull, L M, Stauffer, J R, Noriega-Crespo, A, Padgett, D L, Carey, S J, Hillenbrand, L A, Carpenter, J M, Cole, D M, Stapelfeldt, K R, & Strom, S. E. THE NORTH AMERICAN AND PELICAN NEBULAE. I. IRAC OBSERVATIONS. United States. https://doi.org/10.1088/0004-637X/697/1/787; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Guieu, S, Rebull, L M, Stauffer, J R, Noriega-Crespo, A, Padgett, D L, Carey, S J, Hillenbrand, L A, Carpenter, J M, Cole, D M, Stapelfeldt, K R, and Strom, S. E. 2009. "THE NORTH AMERICAN AND PELICAN NEBULAE. I. IRAC OBSERVATIONS". United States. https://doi.org/10.1088/0004-637X/697/1/787; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21300530,
title = {THE NORTH AMERICAN AND PELICAN NEBULAE. I. IRAC OBSERVATIONS},
author = {Guieu, S and Rebull, L M and Stauffer, J R and Noriega-Crespo, A and Padgett, D L and Carey, S J and Hillenbrand, L A and Carpenter, J M and Cole, D M and Stapelfeldt, K R and Strom, S. E.},
abstractNote = {We present a 9 deg{sup 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{sub 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{sup 2}. The Class I objects are more clustered than the Class II stars.},
doi = {10.1088/0004-637X/697/1/787; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
url = {https://www.osti.gov/biblio/21300530}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 697,
place = {United States},
year = {Wed May 20 00:00:00 EDT 2009},
month = {Wed May 20 00:00:00 EDT 2009}
}