Quiet starts for galaxy simulations

Physics – Fluid Dynamics

Scientific paper

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Astronomical Models, Computerized Simulation, Disk Galaxies, Stellar Motions, Angular Momentum, Circular Orbits, Elliptical Orbits, Fluid Dynamics, Linear Equations

Scientific paper

The ability of computer simulations to reproduce the normal modes of disc galaxies is assessed. Two types of disc are studied: one in which all stars move initially on circular orbits and a second case in which stars have a broad distribution of initial velocities, causing them individually to follow eccentric orbits. Quiet start procedures are developed and found to be advisable for both cases. The observed mode frequencies in the cold disc models are within 2 percent of the linear theory values, while discrepancies of about 10 percent arise in the warm disc models. Nonquiet starts can lead to errors in excess of 50 percent when the same number of particles is used. The polar grid used for the simulations is shown to have further advantages over conventional Cartesian grids.

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