Astronomy and Astrophysics – Astronomy
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..585h&link_type=abstract
Astronomical Journal, vol. 84, May 1979, p. 585-600.
Astronomy and Astrophysics
Astronomy
57
Galactic Evolution, Galactic Rotation, Gravitational Collapse, Relaxation (Mechanics), Stellar Systems, Astronomical Models, Computerized Simulation, Many Body Problem
Scientific paper
The evolution of initially spherical, uniform-density, and uniform-velocity-dispersion stellar systems is investigated by means of a three-dimensional N-body computer model. Some 100,000 simulation stars are used to follow the collapse and relaxation of the system for various amounts of angular momentum in solid-body rotation. For initially low values of the angular momentum satisfying the Ostriker-Pebbles stability criterion the systems quickly relax to an axisymmetric shape and resemble elliptical galaxies in appearance. The maximum flattening for these systems is equivalent only to an E2 system. For larger values of the initial angular momentum bars develop, and the systems undergo a much more drastic evolution. The apparent rotational and random velocities of the barred systems are very sensitive to the viewing direction. An additional complication is the frequent misalignment of the apparent major axis with the direction that reflects the maximum rotation.
Hohl Frank
Zang T. A.
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