Nonlinear phenomena in the gaseous subsystems of flat galaxies

Details Nonlinear phenomena in the gaseous subsystems of flat galaxies Nonlinear phenomena in the gaseous subsystems of flat galaxies

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sval....3..105p&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 3, May 1977, p. 199-203.) Soviet Astronomy Letters, vol. 3, May-June 1977, p. 105-107.

Astronomy and Astrophysics

Astronomy

Galactic Structure, Interstellar Gas, Solitary Waves, Spiral Galaxies, Wave Packets, Astronomical Models, Monochromatic Radiation, Nonlinear Systems, Plane Waves, Wave Equations

Scientific paper

The existence of large-scale solitons in a homogeneous equilibrium self-gravitating gas layer representing a gas subsystem of a flat spiral galaxy is investigated analytically. It is shown that such solitons can exist and may experience a modulational instability leading to the partition of a nonlinear monochromatic wave into separate wave packets. The possibility is proven that two-dimensional nonlinear waves will collapse under certain conditions, and it is found that such collapse develops into a singularity when the basic equations are solved over some finite period of time.

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