Johnstone, D;
Ciccone, S;
Kirk, H;
Mairs, S;
Buckle, J;
Berry, DS;
Broekhoven-Fiene, H;
... Zhu, M; + view all
(2017)
The JCMT Gould Belt Survey: A First Look at IC 5146.
Astrophysical Journal
, 836
(1)
, Article 132. 10.3847/1538-4357/aa5b95.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | The JCMT Gould Belt Survey: A First Look at IC 5146 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/aa5b95 |
| Publisher version: | http://doi.org/10.3847/1538-4357/aa5b95 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | ISM: clouds; ISM: structure; stars: formation; stars: protostars; submillimeter: galaxies; submillimeter: ISM |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1550422 |
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