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Periodic Orbits in Three-Armed Galaxies

Published online by Cambridge University Press:  12 April 2016

Preben J. Grosbøl
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
Panos A. Patsis
Astronomisches Rechen Institut, Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
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Although interarm features in the Population I disk of spiral galaxies frequently give an impression of a three-fold symmetry (Patsis et al., 1997), true three-armed spiral structures in the old stellar disk are seldomly seen. Such systems are of special interest since they display unique conditions which favor the growth of m=3 modes. The face-on spiral NGC 7137 shows a clear three-armed pattern on K-band images and was used as a prototype for the potential of these systems.

A K-band map of NGC 7137 was decomposed in axisymmetric components and a synthetic rotation curve was generated [see (Grosbøl and Patsis, 1998)]. The maximum rotational velocity was taken to be ≈150 km sec−1 corresponding to the mean value given by (Rubin et al., 1982) for this type of galaxy.

Extended Abstracts
Copyright © Kluwer 1999


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