Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jcoph..21..400m&link_type=abstract
Journal of Computational Physics, vol. 21, Aug. 1976, p. 400-437.
Astronomy and Astrophysics
Astrophysics
68
Astronomical Models, Galactic Structure, Many Body Problem, Mathematical Models, Polar Coordinates, Spiral Galaxies, Astrophysics, Computer Programs, Difference Equations, Fourier Transformation, Monte Carlo Method, Particle Collisions, Ring Structures
Scientific paper
Several n-body calculations have simulated disk galaxies by means of a large number of self-gravitating particles moving on a plane, and have indicated many features in agreement with observation, but also some major disagreements. Some gaps remain in the arguments that results of these simulations represent physically valid consequences of a model in which a disk galaxy is composed entirely of stars. A new formulation of the n-body calculation was designed in polar coordinates, and results obtained with it are used to complete the arguments that the disagreement with observation represents a deficiency in the physical model. The physical process of formation of barlike or two-armed spiral structures from a variety of initial conditions is described; the mechanism is not an m = 2 instability in an initially axisymmetric configuration.
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