Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..768h&link_type=abstract
Astronomical Journal, vol. 83, July 1978, p. 768-778.
Astronomy and Astrophysics
Astronomy
50
Astronomical Models, Computerized Simulation, Galactic Evolution, Angular Momentum, Azimuth, Degrees Of Freedom, Galactic Structure, Mathematical Models, Spiral Galaxies, Time Dependence
Scientific paper
A three-dimensional fully self-consistent computer model was used to determine the evolution of galaxies consisting of 100,000 simulation stars with exponential radial density variation. Comparison with two-dimensional (infinitesimally thin disk) simulations showed only a very slight stabilizing effect due to the additional degree of freedom. The addition of a fully self-consistent, nonrotating, exponential core/halo component resulted in considerable stabilization. The most pronounced instabilities present were those due to the Jeans' instability in the outer regions of the disk, while at the same time a relatively slowly-growing bar instability appeared. The two-dimensional disk, plus core/halo simulation, showed the usual fast-growing instability leading to bar formation.
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