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The Heating of Interstellar Gas by Dust

Published online by Cambridge University Press:  23 September 2016

David J. Hollenbach
David J. Hollenbach*
Affiliation:
NASA Ames Research Center

Abstract

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Interstellar grains serve as an intermediary in transferring stellar radiant energy or gas chemical energy into the heating of interstellar gas. Grain photoelectric heating, a process in which ultraviolet photons eject energetic electrons from grains into the gas, dominates the gas heating of the intercloud medium, diffuse clouds, and most photodissociation regions (PDRs); it is also significant in HII regions. Grain photoelectric heating in PDRs can explain the observed correlations of CII(158 μm) with CO J=1-0 intensities and CII(158 μm) + OI(63 μm) with infrared continuum (grain) luminosities. Gas-grain collisions and the infrared emission from grains can dominate the gas heating in molecular clouds with embedded stars. The ejection of newly-formed, vibrationally-excited H2 molecules from grains behind dense, dissociative shocks leads to postshock gas heating which produces strong far-infrared and millimeter line emission as well as H2O maser emission.

Type
Section III: Dust in Dense Clouds
Information
Symposium - International Astronomical Union , Volume 135: Interstellar Dust , 1989 , pp. 227 - 238
Copyright
Copyright © Kluwer 1989 

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