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The Supershell-Molecular Cloud Connection in the Milky Way and Beyond

Published online by Cambridge University Press:  21 March 2013

J. R. Dawson ,
N. M. McClure-Griffiths ,
Y. Fukui ,
J. Dickey ,
T. Wong ,
A. Hughes  and
A. Kawamura
J. R. Dawson
Affiliation:
School of Mathematics & Physics, University of Tasmania, Sandy Bay, TAS 7005, Australia email: joanne.dawson@utas.edu.au
N. M. McClure-Griffiths
Affiliation:
Australia Telescope National Facility, CASS, Marsfield NSW 2122, Australia
Y. Fukui
Affiliation:
Dept. of Astrophysics, Nagoya University, Chikusa-ku, Nagoya, Japan
J. Dickey
Affiliation:
School of Mathematics & Physics, University of Tasmania, Sandy Bay, TAS 7005, Australia email: joanne.dawson@utas.edu.au
T. Wong
Affiliation:
Astronomy Department, University of Illinois, Urbana, IL 61801, USA
A. Hughes
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117, Heidelberg, Germany
A. Kawamura
Affiliation:
National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
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Abstract

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The role of large-scale stellar feedback in the formation of molecular clouds has been investigated observationally by examining the relationship between Hi and 12CO(J = 1−0) in supershells. Detailed parsec-resolution case studies of two Milky Way supershells demonstrate an enhanced level of molecularisation over both objects, and hence provide the first quantitative observational evidence of increased molecular cloud production in volumes of space affected by supershell activity. Recent results on supergiant shells in the LMC suggest that while they do indeed help to organise the ISM into over-dense structures, their global contribution to molecular cloud formation is of the order of only ∼ 10%.

Keywords

galaxies: ISM — ISM: bubbles — ISM: evolution — ISM: molecules — Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 83 - 86
Copyright
Copyright © International Astronomical Union 2013

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