Computer simulation of plasma and N-body problems

Details Computer simulation of plasma and N-body problems Computer simulation of plasma and N-body problems

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977odun.reptq....h&link_type=abstract

Final Report, 1 Jun. 1974 - 31 Dec. 1977 Old Dominion Univ., Norfolk, VA.

Physics

Computerized Simulation, Many Body Problem, Plasmas (Physics), Spiral Galaxies, Galactic Evolution, Magnetohydrodynamic Stability, Star Distribution

Scientific paper

Any spiral structure in computer-generated galaxies is generally short lived and the final state is a rotating bar. The bar thus obtained rotates more slowly than the stars. It has been argued that core/halo components have a stabilizing effect on galaxies and result in longer lived spiral structure. However, numerical experiments with large fixed stellar components representing the core/halo component show that multiarmed spiral structure develops and persists for many rotations but only in an evolving manner. That is, the spiral structure is either wound up into a tight pattern or it is wound up and then reappears again. A recent study of the effect of fixed core/halo components does show that the bar instability is indeed inhibited by a sufficiently large fixed component. The present study determines the effect of a self-consistent (rather than fixed) core/halo component in order to show whether there are any instabilities (such as two-stream) or other important interactions present that may be suppressed with a fixed core. Also studied were the effects of finite thickness of the disk and of three-dimensional essentially spherical core/halo components.

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