Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-27
Astronomy and Astrophysics
Astrophysics
41 pages, 20 figures, to be published in the Astrophysical Journal
Scientific paper
10.1086/309447
We present an observational and theoretical study of the spiral structure in galaxy NGC 1566. A digitized image of NGC 1566 in I-band was used for measurements of the radial dependence of amplitude variations in the spiral arms. We use the known velocity dispersion in the disk of NGC 1566, together with its rotation curve, to construct linear and 2D nonlinear simulations which are then compared with observations. A two-armed spiral is the most unstable linear global mode in the disk of NGC 1566. The nonlinear simulations are in agreement with the results of the linear modal analysis, and the theoretical surface amplitude and the velocity residual variations across the spiral arms are in qualitative agreement with the observations. The spiral arms found in the linear and nonlinear simulations are considerably shorter than those observed in the disk of NGC 1566. We argue therefore, that the surface density distribution in the disk of the galaxy NGC 1566 was different in the past, when spiral structure in NGC 1566 was linearly growing.
Kikuchi Naokichi
Korchagin Vladimir
Miyama Shoken M.
Orlova Natalia
Peterson Bruce A.
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