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Observational constraints on the multiphase ISM

Published online by Cambridge University Press:  05 March 2015

Mark G. Wolfire
Mark G. Wolfire*
Affiliation:
Astronomy Department, University of Maryland, College Park, MD 20742 email: mwolfire@astro.umd.edu
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Abstract

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In recent years we have seen a wealth of new observations and analysis that sheds light on the distribution and physical properties of various ISM phases. In particular the thermal pressure from C I (Jenkins & Tripp 2011) shows the bulk of the CNM phase with a log normal pressure distribution. It appears that thermal instability is important for phase separation, but with with a thermal pressure variation about the mean driven by turbulence. In additional, there is evidence from C I, H2, and complex molecules, of both higher and lower pressure environments. An additional “phase“ that is of increasing interest for high z, low metallicity galaxies is the C+/H2 gas that is not traced by H I or CO. This review presents the observational evidence for the existence and physical properties of these various ISM phases.

Keywords

ISM: generalISM: cloudsISM: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 600 - 602
Copyright
Copyright © International Astronomical Union 2015 

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