Spiral structure as a recurrent instability

Details Spiral structure as a recurrent instability Spiral structure as a recurrent instability

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nyasa.596..158s&link_type=abstract

(Galactic models; Proceedings of the 4th Florida Workshop on Nonlinear Dynamics, Gainesville, FL, Mar. 1, 2, 1989. A91-30826 12-

Astronomy and Astrophysics

Astronomy

1

Digital Simulation, Galactic Evolution, Galactic Structure, Many Body Problem, Spiral Galaxies, Astronomical Models, Galactic Rotation, Wave Scattering

Scientific paper

A snapshot view of galaxies makes it difficult to decide whether spirals are long-lived and slowly evolving or recurrent transient structures. The behavior of N-body simulations has long suggested the latter, but the short-lived waves in the simulations must be understood before it can be argued with confidence that galaxies behave in a similar manner. This paper describes rapidly growing groove instabilities that give rise to large-scale spiral patterns in simulations. Resonant scattering by one wave causes a new instability elsewhere in the disk, leading to a recurrent cycle that promise to account for the rapidly evolving patterns in the simulations. There seems no reason why this instability cycle should not also occur in galaxies.

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