Computer experiments on the effect of retrograde stars in disk galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Angular Momentum, Astronomical Models, Computerized Simulation, Galactic Rotation, Spiral Galaxies, Stellar Rotation, Distribution Functions, Fast Fourier Transformations, Gravitational Fields, Green'S Functions, Numerical Integration, Velocity Distribution

Scientific paper

Using large-scale N-body calculations for flat disk galaxies, we examine the effect of reversing the angular momentum for various fractions of the stars upon the global bar-forming mode. The initial conditions for these simulations are based on stationary states of two classes of models: the isochrones studied recently by Kalnajs by means of linear theory, and a model resembling the Schmidt model of our own Galaxy. In both cases, as the fraction of retrograde stars is increased, the growth of the bar-forming mode is inhibited (although not eliminated). These N-body results for the isochrones agree with the predictions of linear theory, quantitatively as well as qualitatively.

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