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The Influence of Velocity Dispersion on Dynamical Friction in Stellar Discs

Published online by Cambridge University Press:  25 May 2016

Mattias Wahde ,
Karl Johan Donner  and
Björn Sundelius
Mattias Wahde
Affiliation:
Department of Astronomy & Astrophysics, Chalmers University of Technology, S-412 96 Göteborg, Sweden E-mail: wahde@fy.chalmers.se
Karl Johan Donner
Affiliation:
Observatory, P.O. Box 14, SF-00014 University of Helsinki, Finland
Björn Sundelius
Affiliation:
Department of Astronomy & Astrophysics, Chalmers University of Technology, S-412 96 Göteborg, Sweden

Abstract

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We have investigated the force of dynamical friction on a softened point mass orbiting inside a disc galaxy on a planar circular orbit both analytically and by means of numerical simulations. Including a velocity dispersion large enough to stabilise the disc markedly changes the physical picture of the mechanisms producing friction, whereas the numerical value of the friction is almost unaffected. Self-gravity of the disc enhances the friction only by a moderate amount.

Type
Chapter 6: How are we to Understand the Large Scale Structure of the ISM?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 515 - 516
Copyright
Copyright © Kluwer 1996 

References

Donner, K.J. and Sundelius, B. (1993), MNRAS , 265, p. 88 CrossRefGoogle Scholar
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Thomasson, M. (1991), PhD Thesis, Onsala Space Observatory, Chalmers University of Technology, Göteborg, Sweden.Google Scholar
Wahde, M., Donner, K.J. and Sundelius, B. (1994) MNRAS , (submitted) Google Scholar