The JCMT Gould Belt Survey: A First Look at IC 5146
The JCMT Gould Belt Survey: A First Look at IC 5146
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DOI：
10.3847/1538-4357/aa5b95
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发表时间：
2017-01
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通讯作者：
D. Johnstone;S. Ciccone;H. Kirk;S. Mairs;J. Buckle;D. Berry;H. Broekhoven-Fiene;M. Currie;J. Hatchell;T. Jenness;J. Mottram;K. Pattle;Silvia De Francesco;M. Hogerheijde;D. Ward-Thompson;P. Bastien;D. Bresnahan;H. Butner;M. Chen;A. Chrysostomou;S. Coudé;C. Davis;E. Drabek-Maunder;A. Duarte-Cabral;M. Fich;J. Fiege;P. Friberg;R. Friesen;G. Fuller;S. Graves;J. Greaves;J. Gregson;W. Holland;G. Joncas;J. Kirk;L. Knee;K. Marsh;B. Matthews;G. Moriarty-Schieven;C. Mowat;D. Nutter;J. Pineda;C. Salji;J. Rawlings;J. Richer;D. Robertson;E. Rosolowsky;D. Rumble;S. Sadavoy;H. Thomas;N. Tothill;S. Viti;G. White;J. Wouterloot;J. Yates;M. Zhu
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作者：
D. Johnstone;S. Ciccone;H. Kirk;S. Mairs;J. Buckle;D. Berry;H. Broekhoven-Fiene;M. Currie;J. Hatchell;T. Jenness;J. Mottram;K. Pattle;Silvia De Francesco;M. Hogerheijde;D. Ward-Thompson;P. Bastien;D. Bresnahan;H. Butner;M. Chen;A. Chrysostomou;S. Coudé;C. Davis;E. Drabek-Maunder;A. Duarte-Cabral;M. Fich;J. Fiege;P. Friberg;R. Friesen;G. Fuller;S. Graves;J. Greaves;J. Gregson;W. Holland;G. Joncas;J. Kirk;L. Knee;K. Marsh;B. Matthews;G. Moriarty-Schieven;C. Mowat;D. Nutter;J. Pineda;C. Salji;J. Rawlings;J. Richer;D. Robertson;E. Rosolowsky;D. Rumble;S. Sadavoy;H. Thomas;N. Tothill;S. Viti;G. White;J. Wouterloot;J. Yates;M. Zhu
本文介绍了作为詹姆斯·克拉克·麦克斯韦望远镜古尔德带巡天的一部分，对IC 5146恒星形成区进行的450和850 μm亚毫米连续观测。通过与消光图的比较，我们研究了明亮的亚毫米（团块）发射与更大尺度分子云的位置，发现这些更密集的结构与更高的云柱密度相关。使用FellWalker识别了96个单独的亚毫米团块，并检查了它们的物理性质。这些团块的质量相对较大，从0.5到116不等，平均质量为8，中位数质量为3.7。对团块的稳定性分析表明，大多数团块是（热）金斯稳定的。我们进一步将已知原恒星的位置与观测到的亚毫米辐射进行了比较，发现较年轻的原恒星，即0级和I级源，与亚毫米峰值密切相关，并且含有原恒星的团块是最不稳定的。最后，我们对比了IC 5146内两个主要恒星形成区域的演化条件：与茧状星云相关的年轻星团和与北流光细丝相关的更分散的恒星形成区域。茧状星云似乎已经将其质量的很大一部分转化为致密的团块和原恒星，这些团块更有可能是金斯不稳定的，并且这些剩余的团块中有很大一部分包含嵌入的原恒星。然而，北流带有更多的团块，而且大部分已知的原恒星仍然镶嵌在这些团块中。
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 to 116 with a mean mass of 8 and a median mass of 3.7 . A stability analysis for the clumps suggests that the majority are (thermally) Jeans stable, with . 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.