Abstract
Abstract r and 2D nonlinear simulations of spiral structure in the galaxies NGC 488, NGC 1566 and NGC 6503. The observed velocity dispersions and the rotation curves have been used to model background axisymmetric equilibria in these galaxies. The stability properties of the galactic disks are governed by the disk masses and by the ratio of the disk's radial and the vertical velocity dispersions. The massive disk of the galaxy NGC 488 has a few unstable modes with the two-armed spiral being the most unstable one. The nonlinear 2D numerical simulations show that spiral pattern in NGC 488 evolves into a patchy two-armed spiral structure. Disks of Sc galaxies NGC 1566 and NGC 6503 are unstable towards modes m = 2, and m = 3 when the ratio of the vertical to the radial velocity dispersion is about 0.8–1.0. The two-armed spiral is a dominant mode in galaxy NGC 1566, while the m = 3 mode prevails in the disk of NGC 6503. Theoretical spiral arms predicted for NGC 1566 and NGC 6503 are shorter compared to the obs...
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