Generation of spatial structures by nonlinear mass-exchange processes in a multicomponent rotating disk

Details Generation of spatial structures by nonlinear mass-exchange processes in a multicomponent rotating disk Generation of spatial structures by nonlinear mass-exchange processes in a multicomponent rotating disk

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433..520k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 2, p. 520-527

Astronomy and Astrophysics

Astrophysics

1

Astronomical Models, Galactic Evolution, Galactic Structure, Hydrodynamics, Kinematics, Mass Flow, Stability, Gravitation, Interstellar Matter, Landau-Ginzburg Equations, Massive Stars, Nonlinear Equations, Oscillations

Scientific paper

We consider hydrodynamic motions in a multicomponent rotating disk taking into account interchange processes between its three components (cold clouds, warm gas, and massive stars). The analysis of the system's linear stability demonstrates the existence of two branches of oscillations: the 'chemical mode' (C-mode) and the hydrodynamic mode (H-mode). The C-mode as well as the H-mode could be unstable in a rigidly rotating disk without self-gravity. The frequencies and the growth rates of unstable modes depend on parameters of mass-exchange processes and are of the order of a few times the life of massive stars. The nonlinear analysis has been performed under the condition of C-mode instability. The result of the evolution depends on the angular velocity of the disk rotation. Two regimes have been found to exist: the formation of regular grand design spiral waves and the development of spatial chaos. Thus, the nonlinear exchange processes in a rotating multicomponent disk could be a mechanism of generation of different kinds of spatial structures in disk galaxies.

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