Statistics – Computation
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258...96s&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 96-109.
Statistics
Computation
25
Barred Galaxies, Density Wave Model, Galactic Structure, Hydrodynamics, Spiral Galaxies, Computational Fluid Dynamics, Density Distribution, Galactic Rotation, Mass Distribution, Two Dimensional Models
Scientific paper
The gravitational response of a uniform, isothermal, massless gas disk to a uniformly rotating prolate potential is tested by computing a series of two-dimensional hydrodynamical models whose prolate bar mass distribution and rotation property parameters are varied from model to model. The location and strength of the region in which hydrodynamic shocks are found are dependent on the radial distribution of mass within the bar and on the axial ratio of the bar potential, with the corotation radius determining whether the galaxy has a ring or spiral morphology. It is proposed that the range of morphologies from the barred to the unbarred is a consequence of prolate potential amplitude variations, and it is suggested that the full spectrum of normal two-armed trailing spiral patterns observed in galaxies may be produced by rotating bar-like potentials.
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