Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..785m&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Feb. 1, 1979, p. 785-797.
Astronomy and Astrophysics
Astrophysics
124
Astronomical Models, Galactic Rotation, Galactic Structure, Stellar Motions, Angular Momentum, Astrodynamics, Dynamic Models, Particle Motion, Self Consistent Fields, Three Dimensional Models
Scientific paper
The dynamical properties of a prolate bar have been studied by means of a three-dimensional computer model. The bar pattern rotates in the sense of the total angular momentum. The mean particle motion is a rapid streaming in the direction of pattern rotation as seen from a frame that rotates with the bar. Rotation rates that would be inferred from observation are significantly (2-3 times) faster than the pattern rotation speed. Velocity dispersions are anisotropic with the largest component along the bar. Particles oscillate in the bar potential significantly faster than pattern rotation. About 25% of the star orbits are near 2:2:1 resonance with the slow motion along the bar. Particle motion is highly ordered in the bar. Observable properties are described; where comparisons can be made, observable properties are in agreement with observations of brightness contours, velocity fields, and velocity dispersions. The bar has nearly exponential density profiles.
Miller Richard H.
Smith Barbara F.
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