Polygonal structures in a gaseous disk: Numerical simulations |
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Authors: | S A Khoperskov A V Khoperskov M A Eremin M A Butenko |
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Institution: | (1) Institute of Astronomy of the Russian Academy of Sciences, Pyatnitskaya st. 48, Moscow, Russia |
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Abstract: | The results of numerical simulations of a gaseous disk in the potential of a stellar spiral density wave are presented. The
conditions under which straightened spiral arm segments (rows) form in the gas component are studied. These features of the
spiral structure were identified in a series of works by A.D. Chernin with coauthors. Gas-dynamic simulations have been performed
for a wide range of model parameters: the pitch angle of the spiral pattern, the amplitude of the stellar spiral density wave,
the disk rotation speed, and the temperature of the gas component. The results of 2D- and 3D-disk simulations are compared.
The rows in the numerical simulations are shown to be an essentially nonstationary phenomenon. A statistical analysis of the
distribution of geometric parameters for spiral patterns with rows in the observed galaxies and the constructed hydrodynamic
models shows good agreement. In particular, the numerical simulations and observations of galaxies give 〈α〉 }~ 120° for the
average angles between straight segments. |
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Keywords: | |
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