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

Autor: D. Johnstone, S. Ciccone, H. Kirk, S. Mairs, J. Buckle, D. S. Berry, H. Broekhoven-Fiene, M. J. Currie, J. Hatchell, T. Jenness, J. C. Mottram, K. Pattle, S. Tisi, J. Di Francesco, M. R. Hogerheijde, D. Ward-Thompson, P. Bastien, D. Bresnahan, H. Butner, M. Chen, A. Chrysostomou, S. Coudé, C. J. Davis, E. Drabek-Maunder, A. Duarte-Cabral, M. Fich, J. Fiege, P. Friberg, R. Friesen, G. A. Fuller, S. Graves, J. Greaves, J. Gregson, W. Holland, G. Joncas, J. M. Kirk, L. B. G. Knee, K. Marsh, B. C. Matthews, G. Moriarty-Schieven, C. Mowat, D. Nutter, J. E. Pineda, C. Salji, J. Rawlings, J. Richer, D. Robertson, E. Rosolowsky, D. Rumble, S. Sadavoy, H. Thomas, N. Tothill, S. Viti, G. J. White, J. Wouterloot, J. Yates, M. Zhu
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: ASTROPHYSICAL JOURNAL (ISSN 0004-637X), 836, 132
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 D, Hogerheijde, M R, Ward-Thompson, D, Bastien, P, Bresnahan, D, Butner, H, Chen, M, Chrysostomou, A, Coudé, S, Davis, C J, Drabek-Maunder, E, Duarte-Cabral, A, Fich, M, Fiege, J, Friberg, P, Friesen, R, Fuller, G A, Graves, S, Greaves, J, Gregson, J, Holland, W, Joncas, G, Kirk, J M, Knee, L B G, Marsh, K, 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 & Zhu, M 2017, ' The JCMT Gould Belt Survey : A First Look at IC 5146 ', Astrophysical Journal, vol. 836, no. 1, 132 . https://doi.org/10.3847/1538-4357/aa5b95
ISSN: 1538-4357
0004-637X
Popis: We present 450 and 850 micron submillimetre continuum observations of the IC5146 star-forming region taken as part of the JCMT Gould Belt Survey. We investigate the location of bright submillimetre (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 submillimetre clumps are identified using FellWalker and their physical properties are examined. These clumps are found to be relatively massive, ranging from 0.5to 116 MSun with a mean mass of 8 MSun and a median mass of 3.7 MSun. A stability analysis for the clumps suggest that the majority are (thermally) Jeans stable, with M/M_J < 1. We further compare the locations of known protostars with the observed submillimetre emission, finding that younger protostars, i.e., Class 0 and I sources, are strongly correlated with submillimetre 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 IC5146: 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.
30 pages, 11 figures, 8 tables, accepted by ApJ
Databáze: OpenAIRE
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