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- W1640498839 abstract "It is generally assumed that the solution of the galactic shock wave is a local one and that no account of gaseous self-gravitation is taken in the theory of stellar density wave. Both assumptions are dropped in this paper, and the unsteady two-dimensional gas dynamic equations with gaseous self-gravitation are solved. The formation process of the galactic shock wave is studied responding to an applied perturbed spiral gravitational field within an initial axisymmetric gaseous disk, and the velocity and gas density distributions with the properties of galactic shock wave are obtained. The features of local shock wave solution without gaseous self-gravitation are qualitatively similar to but quantitatively different from the results of this paper. The calculation shows that the pattern velocity of galactic shock grand design varies both in time and in space. The magnitude of variation in the shock pattern velocity from that of the applied density wave exceeds even the pattern velocity of the applied density wave. Because a typical time for the formation of shock waves is about 5 x 10/sup 8/ yr, it is difficult to maintain the galactic density wave with quasistationary properties, because of the relative winding between the shock pattern and the appliedmore » density wave pattern. However, there clearly exists a large-scale galactic shock-wave grand design at all times.« less" @default.
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- W1640498839 date "1982-04-01" @default.
- W1640498839 modified "2023-09-26" @default.
- W1640498839 title "Evolution of the galactic shock wave in density-wave theory" @default.
- W1640498839 hasPublicationYear "1982" @default.
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