The JCMT Gould Belt Survey: A First Look at IC 5146

Journal Article · Thu Feb 09 23:00:00 EST 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA5B95· OSTI ID:22869348

Johnstone, D.; Ciccone, S.; Kirk, H.; Mairs, S.; Broekhoven-Fiene, H.; Francesco, J. Di; Chen, M. ^[1]; Buckle, J. ^[2]; Berry, D. S.; Currie, M. J. ^[3]; Hatchell, J. ^[4]; Jenness, T. ^[5]; Mottram, J. C.; Hogerheijde, M. R. ^[6]; Pattle, K.; Ward-Thompson, D.; Bresnahan, D. ^[7]; Tisi, S. ^[8]; Bastien, P. ^[9]; Butner, H. ^[10] ; others, and

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1. NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7 (Canada)
2. Astrophysics Group, Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE (United Kingdom)
3. East Asian Observatory, 660 North A‘ohōkū Place, University Park, Hilo, Hawaii 96720 (United States)
4. Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom)
5. Large Synoptic Survey Telescope Project Office, 933 N. Cherry Avenue, Tucson, Arizona 85721 (United States)
6. Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands)
7. Jeremiah Horrocks Institute, University of Central Lancashire, Preston, Lancashire, PR1 2HE (United Kingdom)
8. Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada)
9. Université de Montréal, Centre de Recherche en Astrophysique du Québec et département de physique, C.P. 6128, succ. centre-ville, Montréal, QC, H3C 3J7 (Canada)
10. James Madison University, Harrisonburg, Virginia 22807 (United States)

We present 450 and 850 μm submillimeter continuum observations of the IC 5146 star-forming region taken as part of the James Clerk Maxwell Telescope Gould Belt Survey. We investigate the location of bright submillimeter (clumped) emission with the larger-scale molecular cloud through comparison with extinction maps, and find that these denser structures correlate with higher cloud column density. Ninety-six individual submillimeter clumps are identified using FellWalker, and their physical properties are examined. These clumps are found to be relatively massive, ranging from 0.5 M{sub ⊙} to 116 M{sub ⊙} with a mean mass of 8 M{sub ⊙} and a median mass of 3.7 M{sub ⊙}. A stability analysis for the clumps suggests that the majority are (thermally) Jeans stable, with M/M{sub J}<1. We further compare the locations of known protostars with the observed submillimeter emission, finding that younger protostars, i.e., Class 0 and I sources, are strongly correlated with submillimeter peaks and that the clumps with protostars are among the most Jeans unstable. Finally, we contrast the evolutionary conditions in the two major star-forming regions within IC 5146: the young cluster associated with the Cocoon Nebula and the more distributed star formation associated with the Northern Streamer filaments. The Cocoon Nebula appears to have converted a higher fraction of its mass into dense clumps and protostars, the clumps are more likely to be Jeans unstable, and a larger fraction of these remaining clumps contain embedded protostars. The Northern Streamer, however, has a larger number of clumps in total and a larger fraction of the known protostars are still embedded within these clumps.

• OSTI ID: 22869348
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 836; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
DENSITY
EMISSION
GALAXIES
MASS
NEBULAE
PROTOSTARS
STAR EVOLUTION
STARS
TELESCOPES