Nonlinear corrugation waves in spiral galaxies
Abstract
Numerical computations of nonlinear corrugation waves in the gas disc of a spiral galaxy are reported. To obtain a tractable problem the set of fully threedimensional hydrodynamic equations is reduced to a set of equations in two space dimensions by assuming that the global morphology of the corrugations is spiral, and then employing the tightly wound spiral approximation. The results indicate that the corrugation may be dynamically very significant leading to a strong variation in the gas density across the galactic disc. A corrugation which is singly periodic in azimuth produces a doubly periodic density enhancement, and the response can be strong enough to form a twoarm spiral shock.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 April 1980
 DOI:
 10.1093/mnras/191.2.221
 Bibcode:
 1980MNRAS.191..221N
 Keywords:

 Gas Dynamics;
 Gravitational Fields;
 Spiral Galaxies;
 Computerized Simulation;
 Galactic Structure;
 Gas Density;
 Hydrodynamic Equations;
 Numerical Analysis;
 Astrophysics