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Astron. Astrophys. 326, 493-500 (1997)
Dynamical spectra of barred galaxies
P.A. Patsis 1,
C. Efthymiopoulos 2,
G. Contopoulos 2 and
N. Voglis 2
1 Max-Planck-Institut für Astronomie, Königstuhl
17, D-69117 Heidelberg, Germany
2 Department of Astronomy, University of Athens, GR-15784
Athens, Greece
Received 24 March 1997 / Accepted 15 April 1997
Abstract
We apply the method of dynamical spectra in the case of a barred galaxy potential. We show its efficiency in detecting tiny ordered domains embedded in big chaotic seas. We can separate ordered from chaotic domains in the corotation region by integrating a number of orbits only for 10-20 orbital periods each. The method is more efficient than the use of the Poincaré section, while other methods require a much longer time. Our method of separation between ordered and chaotic orbits is useful when attacking the self-consistency problem in the corotation region of galaxies. Then we describe the differences between the dynamical spectra of orbits in a transition region from ordered to chaotic.
Key words: galaxies: kinematics and dynamics
Send offprint requests to: P.A. Patsis
Contents
- 1. Introduction
- 2. Definitions
- 3. Distinction between regular and chaotic domains
- 4. The transition from order to chaos
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: October 15, 1997
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