The JCMT Gould Belt Survey: A First Look at IC 5146
Abstract
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.
Keywords
Cite
@article{arxiv.1701.04898,
title = {The JCMT Gould Belt Survey: A First Look at IC 5146},
author = {D. Johnstone and S. Ciccone and H. Kirk and S. Mairs and J. Buckle and D. S. Berry and H. Broekhoven-Fiene and M. J. Currie and J. Hatchell and T. Jenness and J. C. Mottram and K. Pattle and S. Tisi J. Di Francesco and M. R. Hogerheijde and D. Ward-Thompson and P. Bastien and D. Bresnahan and H. Butner and M. Chen and A. Chrysostomou and S. Coude and C. J. Davis and E. Drabek-Maunder and A. Duarte-Cabral and M. Fich and J. Fiege and P. Friberg and R. Friesen and G. A. Fuller and S. Graves and J. Greaves and J. Gregson and W. Holland and G. Joncas and J. M. Kirk and L. B. G. Knee and K. Marsh and B. C. Matthews and G. Moriarty-Schieven and C. Mowat and D. Nutter and J. E. Pineda and C. Salji and J. Rawlings and J. Richer and D. Robertson and E. Rosolowsky and D. Rumble and S. Sadavoy and H. Thomas and N. Tothill and S. Viti and G. J. White and J. Wouterloot and J. Yates and M. Zhu},
journal= {arXiv preprint arXiv:1701.04898},
year = {2017}
}
Comments
30 pages, 11 figures, 8 tables, accepted by ApJ