Application of the global modal approach to the spiral galaxies |
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| Authors: | Natalia Orlova Vladimir Korchagin Nobuhiro Kikuchi Shoken M Miyama Aleksei Moiseev |
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| Institution: | (1) Institute of Physics, Rostov University, Stachki 194, Rostov-on-Don, Russia, 344090;(2) National Space Development Agency of Japan, Earth Observation Research Center, 1-8-10 Harumi, Chuo-ku, Tokyo 104-6023, Japan;(3) National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan;(4) Special Astrophysical Observatory, Nizhnij Arkhyz, Karachaevo-Cherkesia, 369167, Russia |
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| Abstract: | 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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | galaxies: kinematics and dynamics: structure |
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