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Periodic Orbits in Three-Armed Galaxies

  • Preben J. Grosbøl (a1) and Panos A. Patsis (a2)

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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.

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References

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Contopoulos, G., Grosbøl, P.: 1986, A&A, 155, 11
Contopoulos, G., Grosbøl, P.: 1988, A&A, 197, 83
Grosbøl, P. Patsis, P.A.: 1998, A&A, 336, 840
Patsis, P.A., Grosbøl, P., Hiotelis, N.: 1997, A&A, 323, 762
Rubin, V.C., Ford, W.K. Jr., Thonnard, N.. Burstein, D.: 1982, ApJ, 261, 439

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