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Atomic and Molecular Phases of the Interstellar Medium

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Mordecai-Mark Mac Low
Mordecai-Mark Mac Low*
Affiliation:
Dept. of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA and Institut für Theoretische Astrophysik, Zentrum für Astronomie der Universität Heidelberg, Albert-Ueberle-Str. 2, 69121 Heidelberg, Germany email: mordecai@amnh.org
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Abstract

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This review covers four current questions in the behavior of the atomic and molecular interstellar medium. These include whether the atomic gas originates primarily in cold streams or hot flows onto galaxies; what the filling factor of cold gas actually is in galactic regions observationally determined to be completely molecular; whether molecular hydrogen determines or merely traces star formation; and whether gravity or turbulence drives the dynamical motions observed in interstellar clouds, with implications on their star formation properties.

Keywords

astrochemistryhydrodynamicsMHDturbulenceshock wavesISM: generalISM: structureISM: moleculesISM: kinematics and dynamics

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