The JCMT Gould Belt Survey: a first look at IC 5146

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DOIResolve DOI: http://doi.org/10.3847/1538-4357/aa5b95
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
1538-4357
Volume836
Issue1
Pages# of pages: 21
SubjectISM: clouds; ISM: structure; stars: formation; stars: protostars; submillimeter: galaxies; submillimeter: ISM
AbstractWe present 450 and 850 mum 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}&sun; to 116 {M}&sun; with a mean mass of 8 {M}&sun; and a median mass of 3.7 {M}&sun; . A stability analysis for the clumps suggests that the majority are (thermally) Jeans stable, with M/{M}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.
Publication date
PublisherAmerican Astronomical Society
LanguageEnglish
AffiliationNRC Herzberg Astronomy and Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number23002196
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Record identifier585b478a-bff8-4189-9e53-137156dcecbf
Record created2017-09-01
Record modified2017-09-01
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