Dynamical friction in disc galaxies with non-zero velocity dispersion

Details Dynamical friction in disc galaxies with non-zero velocity dispersion Dynamical friction in disc galaxies with non-zero velocity dispersion

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281.1165w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 281, p. 1165

Astronomy and Astrophysics

Astronomy

10

Celestial Mechanics, Stellar Dynamics, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Kinematics And Dynamics

Scientific paper

We investigate the force of dynamical friction on a softened point mass orbiting inside a disc galaxy on a planar circular orbit. The effects of velocity dispersion in the disc on the force are studied both theoretically and by means of numerical simulations. The analytical results, valid for small values of the velocity dispersion, show that the total effect of the velocity dispersion is relatively small, although the contributions from different resonant terms change by large amounts. For non-self-gravitating simulations with small disc masses our analytical predictions are in acceptable agreement with the measured force. For larger values of the velocity dispersions the frictional force in non- self-gravitating models is still only weakly affected for the perturber masses that we consider. We also find that the inclusion of self-gravity in the simulations has only a moderate effect on the force of dynamical friction. As a summary of our results we propose a simple formula which under most practical circumstances should give a sufficiently accurate estimate for the dynamical friction from a disc.

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