Spiral Structure as a Recurrent Instability

Details Spiral Structure as a Recurrent Instability Spiral Structure as a Recurrent Instability

1999-09-05

arxiv.org/abs/astro-ph/9909093v1

Astrophys.Space Sci. 272 (2000) 31-43

Astronomy and Astrophysics

Astrophysics

To appear in "Astrophysical Dynamics -- in Commemoration of F. D. Kahn", eds. D. Berry, et al. (Dordrecht: Kluwer) - 5 figures

Scientific paper

10.1023/A:1002668818252

A long-standing controversy in studies of spiral structure has concerned the lifetimes of individual spiral patterns. Much theoretical work has sought quasi-stationary spiral modes while N-body simulations have consistently displayed recurrent, short-lived patterns. The simulations manifest a recurrent cycle of true instabilities related to small-scale features in the angular momentum distribution of particles, with the decay of each instability seeding the growth of the next. Data from the recent Hipparcos mission seem to offer support for the recurrent transient picture.

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