Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0605c&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #06.05; Bulletin of the American Astronomical Society, Vol. 25, p.798
Astronomy and Astrophysics
Astronomy
Scientific paper
Although two dimensional N-body simulations of disk galaxies have been done for over thirty years, we feel that the interactions between various free parameters deserve further study. As a preliminary step in validating a computer code with collisionless particles representing star clusters, colliding particles representing giant molecular clouds, and a gravitating hydrodynamic component representing the intercloud medium, we study the effects of the number of particles (10k-400k), the softening of the gravitational potential (.25-1.0 cell widths), and the grid size (64(2) and 128(2) ) on the changes of Toomre's Q and the bar-mode (m=2) instability for the collisionless N-body component. We use a Cartesian grid with a time-centered leap frog integration scheme and a fast Fourier transform potential calculator. We find that the growth of Q and the bar mode depend sensitively on both N and the softening factor. We also find that as N increases, the amount of softening required to maintain cool systems decreases. Judicious selection of parameters can minimize growth rates of various instabilities, thereby increasing relaxation times.
Comins Neil F.
Rivers A. J.
Shorey Peter
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