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Energy balance in the interstellar medium

Published online by Cambridge University Press:  14 August 2015

E. E. Salpeter
E. E. Salpeter*
Affiliation:
Astronomy and Physics Depts., Cornell University

Abstract

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A large number (approximately 7) of different components or phases are needed to describe the interstellar medium. The neutral intercloud medium is probably a composite of (a) “lukewarm, substandard” clouds (heated by grain photoeffect and shockwaves), (b) the interfaces between clouds and coronal gas and (c) some “phase 2” gas heated by soft X-rays. Ionizing UV photons are mainly produced by OB-stars and are responsible for most of the average electron density. Bulk kinetic energy for “stirring” the medium and soft X-rays are mainly produced by supernova remnants, less by O-star stellar winds.

Type
V. PHYSICAL PROPERTIES OF THE INTERSTELLAR MEDIUM
Information
Symposium - International Astronomical Union , Volume 84: The Large-Scale Characteristics of the Galaxy , 1979 , pp. 245 - 252
Copyright
Copyright © Reidel 1979 

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