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

Johnstone, D., Ciccone, S., Kirk, H., Mairs, S., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Hatchell, J., Jenness, T., Mottram, J. C., Pattle, K., Tisi, S., Francesco, J. Di, Hogerheijde, M. R., Ward-Thompson, D., Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C. J., Drabek-Maunder, Emily ORCID:, Duarte Cabral, Ana ORCID:, Fich, M., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, Jane ORCID:, Gregson, J., Holland, W., Joncas, G., Kirk, J. M., Knee, L. B. G., Marsh, Kenneth ORCID:, Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Nutter, D., Pineda, J. E., Salji, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J. and Zhu, M. 2017. The JCMT Gould Belt Survey: a first look at IC 5146. The Astrophysical Journal 836 (1) , 132. 10.3847/1538-4357/aa5b95

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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 ${M}_{\odot }$ to 116 ${M}_{\odot }$ with a mean mass of 8 ${M}_{\odot }$ and a median mass of 3.7 ${M}_{\odot }$. A stability analysis for the clumps suggests that the majority are (thermally) Jeans stable, with $M/{M}_{J}\lt 1$. 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: ISM: clouds; ISM: structure; stars: formation; stars: protostars; submillimeter: galaxies; submillimeter: ISM
Publisher: IOP Publishing
ISSN: 15384357
Date of First Compliant Deposit: 25 July 2017
Date of Acceptance: 3 January 2017
Last Modified: 05 Dec 2023 02:48

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