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Cloud Formation in a Galactic Fountain Resulting from Rayleigh-Taylor Instabilities

Published online by Cambridge University Press:  12 April 2016

D.L. Berry ,
M.A. de Avillez  and
F.D. Kahn
D.L. Berry
Affiliation:
Departamento de Física, Universidade de Évora, R. Romão Ramalho 59, 7000 Évora, Portugal
M.A. de Avillez
Affiliation:
Departamento de Física, Universidade de Évora, R. Romão Ramalho 59, 7000 Évora, Portugal
F.D. Kahn
Affiliation:
Department of Physics and Astronomy, University of ManchesterSchuster Laboratory, Manchester M13 9PL, England

Abstract

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Intermediate and high velocity clouds are produced in a Galactic fountain as a result of Rayleigh-Taylor instabilities that grow at the interface separating the cool descending gas and the hot ascending gas within the fountain flow. It is proposed here that there is no need to introduce any initial perturbation to the system in order to trigger such instabilities. They will arise naturally as a result of the difference in the adiabatic parameters above and below the interface. A three-dimensional study of the unstable layer and the resulting cloud formation is presented.

Type
Part VIII High-Velocity Clouds, Galactic Halo Models, Observations of the LMC
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 499 - 502
Copyright
Copyright © Springer-Verlag 1998

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