On the asymptotic behavior of the super sonic interstellar gas flow which is made by spiral density wave, propagating in rapidly rotating galaxy disk

Details On the asymptotic behavior of the super sonic interstellar gas flow which is made by spiral density wave, propagating in rapidly rotating galaxy disk On the asymptotic behavior of the super sonic interstellar gas flow which is made by spiral density wave, propagating in rapidly rotating galaxy disk

1998-08-07

arxiv.org/abs/astro-ph/9808071v1

Astrophysics and Space Science, v. 274, Issue 3, p. 513-522 (2000)

Astronomy and Astrophysics

Astrophysics

12 pages Latex, 2 figures, Talk given at The 15-th annual Pushchino meeting "The Modern Problems of Extragalactic Astronomy",

Scientific paper

10.1023/A:1026548801723

Nonlinear solutions for the large-scale flow of interstellar gas in the presence of a spiral gravitational field have received considerable attention because this model allows to explain a lot of observations for galaxy disks. However this investigations were forced to limit by numerable analysis of the problem because of its nonlinearity. In this paper we wish to carry out the analytical expression which allows us to describe the super sonic nonlinear interstellar gas flow in rapidly rotating galaxy disk which is made by the spiral density wave. One of characteristic parameters of theory is the amplitude of spiral density wave potential corresponding to separatrix, which separates super sonic flows from flows containing the jump from super sonic flows to subsonic. We have defined the dependence of perturbing potential value, under which the galaxy shock wave appeared with respect to the parameters characterizing the gas disk (such as sound speed in gas, disk rotation speed, "spiral design" rotation speed).

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