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"Collective processes and structures in spiral galaxies" E. Polyachenko Abstract: 1. A new approach to studying global structures in thin stellar disks,
which allows to describe universally both bar and spiral modes, is
presented. They are considered as the low-frequency normal modes in a
disc of orbits precessing at different angular speeds.
The problem of determining the normal modes is reduced to a simple
integral equation in the form of the classical eigen-value problem, where the
eigen-value is directly equal to the pattern speed of the mode.
http://xxx.lanl.gov/abs/astro-ph/0312595 |