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Astron. Astrophys. 326, 493-500

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Dynamical spectra of barred galaxies

P.A. Patsis1, C. Efthymiopoulos2, G. Contopoulos2, and N. Voglis2

1Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2Department of Astronomy, University of Athens, GR-15784 Athens, Greece

Received 24 March 1997 / Accepted 15 April 1997


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

© European Southern Observatory (ESO) 1997

Online publication: September 18, 1997
Last change: October 15, 1997