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The state of molecular gas in the Small Magellanic Cloud

Published online by Cambridge University Press:  01 July 2008

Adam K. Leroy ,
Alberto D. Bolatto ,
Erik Rosolowsky ,
Snežana Stanimirović ,
Norikazu Mizuno ,
Caroline Bot ,
Frank Israel ,
Fabian Walter  and
Leo Blitz
Adam K. Leroy
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany
Alberto D. Bolatto
Affiliation:
Department of Astronomy and Laboratory for Millimeter-wave Astronomy, University of Maryland, USA
Erik Rosolowsky
Affiliation:
Department of Mathematics, Statistics, and Physics, University British Columbia at Okanagan, Canada
Snežana Stanimirović
Affiliation:
Department of Astronomy, University of Wisconsin, USA
Norikazu Mizuno
Affiliation:
Department of Astrophysics, Nagoya University, Japan
Caroline Bot
Affiliation:
Observatoire Astronomique de Strasbourg, France
Frank Israel
Affiliation:
Sterrewacht Leiden, The Netherlands
Fabian Walter
Affiliation:
Max Planck Institute for Astronomy, Heidelberg, Germany
Leo Blitz
Affiliation:
Department of Astronomy and Radio Astronomy Laboratory, U.C. Berkeley, USA
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Abstract

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We compare the resolved properties of giant molecular clouds (GMCs) in the Small Magellanic Cloud (SMC) and other low mass galaxies to those in more massive spirals. When measured using CO line emission, differences among the various populations of GMCs are fairly small. We contrast this result with the view afforded by dust emission in the Small Magellanic Cloud. Comparing temperature-corrected dust opacity to the distribution of H i suggests extended envelopes of CO-free H2, implying that CO traces only the highest density H2 in the SMC. Including this CO-free H2, the gas depletion time, H2-to-H i ratio, and H2-to-stellar mass/light ratio in the SMC are all typical of those found in more massive irregular galaxies.

Keywords

ISM: cloudsgalaxies: dwarfgalaxies: individual (SMC)galaxies: ISMMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 154 - 159
Copyright
Copyright © International Astronomical Union 2009

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