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Supershells

Published online by Cambridge University Press:  12 April 2016

Richard McCray
Richard McCray*
Affiliation:
Joint, Institute for Laboratory Astrophysics, University of Colorado, Boulder, CO 80309-0440, USA

Abstract

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Repeated supernovae from an OB association will, in a few ×107 yr, create a cavity of coronal gas in the interstellar medium, with radius > 100 pc, surrounded by a dense expanding shell of cool interstellar gas. Such a cavity will likely burst through the gas layer of a disk galaxy. Such holes and “supershells” have been observed in optical and H I radio emission maps of the Milky Way and other nearby galaxies. The gas swept up in the supershell is likely to become gravitationally unstable, providing a mechanism for propagating star formation that may be particularly effective in irregular galaxies.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 101: Supernova Remnants and the Interstellar Medium , 1988 , pp. 447 - 459
Copyright
Copyright © Cambridge University Press 1988

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