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Formation of the twin galactic starburst regions NGC 6357 and NGC 6334

Published online by Cambridge University Press:  31 March 2017

Kazufumi Torii ,
Keisuke Hasegawa ,
Akio Ohama ,
Hiroaki Yamamoto ,
Kengo Tachihara  and
Yasuo Fukui
Kazufumi Torii
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
Keisuke Hasegawa
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
Akio Ohama
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
Hiroaki Yamamoto
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
Kengo Tachihara
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
Yasuo Fukui
Affiliation:
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan. email: torii@a.phys.nagoya-u.ac.jp
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Abstract

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New CO J=1–0 observations with NANTEN and NANTEN2 reveal that extensive collisions between two molecular clouds at relative velocity of 15 km s−1 triggered the O star formation in the Galactic mini-starbursts NGC 6357 and NGC 6334. Correlated/anti-correlated gas distributions and intermediate velocity features between the two clouds lend support for the cloud-cloud collision scenario. The timescale of the collision and high-mass star formation is as short as less than 0.5 Myrs, suggesting rapid O star 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. 173 - 174
Copyright
Copyright © International Astronomical Union 2017 

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