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Formation of the super star cluster RCW 38 triggered by cloud-cloud collision

Published online by Cambridge University Press:  31 March 2017

Yasuo Fukui
Yasuo Fukui*
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: [email protected]
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Abstract

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RCW 38 is the youngest super star cluster in the Galaxy and is located at a distance of 1.7 kpc. Molecular observations revealed that the cluster is associated with two molecular clouds having velocity difference of 12 km s−1. We interpret that the two clouds are colliding with each other and the collision triggered the cluster formation. The natal molecular gas still survives within ~ 0.5 pc of the central O stars which have an age of 0.1 Myrs as inferred from the collision morphology. We suggest that the high column density of one of the clouds 1023 cm−2 enabled formation of ~ 20 O stars in the cluster center and discuss the implications on massive cluster formation.

Keywords

ISM: clouds — ISM: molecules — ISM: kinematics and dynamics — stars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 208 - 213
Copyright
Copyright © International Astronomical Union 2017 

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