Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-25
Astrophys.Space Sci. 284 (2003) 739-742
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, to appear in the proceedings of "The Evoution of Galaxies. III. From simple approaches to self-consistent m
Scientific paper
10.1023/A:1024040331638
We have tested the applicability of the global modal approach in the density wave theory of spiral structure for a sample of spiral galaxies with measured axisymmetric background properties. We report here the results of the simulations for four galaxies: NGC 488, NGC 628, NGC 1566, and NGC 3938. Using the observed radial distributions for the stellar velocity dispersions and the rotation velocities we have constructed the equilibrium models for the galactic disks in each galaxy and implemented two kinds of stability analyses - the linear global analysis and 2D-nonlinear simulations. In general, the global modal approach is able to reproduce the observed properties of the spiral arms in the galactic disks. The growth of spirals in the galactic disks can be physically understood in terms of amplification by over-reflection at the corotation resonance. Our results support the global modal approach as a theoretical explanation of spiral structure in galaxies.
Kikuchi Naokichi
Korchagin Vladimir I.
Miyama Shoken M.
Moiseev Aleksei V.
Orlova N. V.
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