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Molecular clouds toward the super star cluster NGC 3603; possible evidence for a cloud-cloud collision in triggering the cluster formation

Citation

Fukui, Y and Ohama, A and Hanaoka, N and Furukawa, N and Torii, K and Dawson, JR and Mizuno, N and Hasegawa, K and Fukuda, T and Soga, S and Moribe, N and Kuroda, Y and Hayakawa, T and Kawamura, A and Kuwahara, T and Yamamoto, H and Okuda, T and Onishi, T and Maezawa, H and Mizuno, A, Molecular clouds toward the super star cluster NGC 3603; possible evidence for a cloud-cloud collision in triggering the cluster formation, Astrophysical Journal, 780, (1) Article 36. ISSN 0004-637X (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 The American Astronomical Society

DOI: doi:10.1088/0004-637X/780/1/36

Abstract

We present new large field observations of molecular clouds with NANTEN2 toward the super star cluster NGC 3603 in the transitions 12CO(J = 2-1,J = 1-0) and 13CO(J = 2-1, J = 1-0). We suggest that two molecular clouds at 13 km s-1 and 28 km s-1 are associated with NGC 3603 as evidenced by higher temperatures toward the H II region, as well as morphological correspondence. The mass of the clouds is too small to gravitationally bind them, given their relative motion of ~20 km s-1. We suggest that the two clouds collided with each other 1 Myr ago to trigger the formation of the super star cluster. This scenario is able to explain the origin of the highest mass stellar population in the cluster, which is as young as 1 Myr and is segregated within the central sub-pc of the cluster. This is the second super star cluster along with Westerlund 2 where formation may have been triggered by a cloud-cloud collision.

Item Details

Item Type:Refereed Article
Keywords:ISM: clouds, open clusters and associations: individual (NGC 3603), radio lines: ISM
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dawson, JR (Dr Joanne Dawson)
ID Code:98561
Year Published:2014
Web of Science® Times Cited:41
Deposited By:Mathematics and Physics
Deposited On:2015-02-19
Last Modified:2017-11-03
Downloads:188 View Download Statistics

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