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Structure of the Diffuse Interstellar Medium

Published online by Cambridge University Press:  12 April 2016

Donald P. Cox
Donald P. Cox*
Affiliation:
Department of Physics, University of Wisconsin-Madison1150 University Ave., Madison, WI, 53706, USA

Abstract

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The interstellar medium has a thick disk structure (|z | ≲ 1500 pc, the ECL or extracloud layer) with a thin zone of cloud contamination at |z | ≲ 100 pc. The properties of all components other than clouds (e.g. cosmic rays, magnetic field, extracloud matter, pressure) drop slowly with |z| across the thick distribution, giving this layer a very important influence in the evolution of superbubbles. It seems likely to quench blowout or breakout and virtually all fountain activity. The weight of this layer stabilizes the clouds at low z; its high pressure and low density provide a cushion for impacts of infailing clouds.

Type
VII. The Structure of the Interstellar Medium
Information
International Astronomical Union Colloquium , Volume 120: Structure and Dynamics of the Interstellar Medium , 1989 , pp. 500 - 510
Copyright
Copyright © Springer-Verlag 1989

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