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Periodic Orbits and Gas Flow in Barred Spiral Galaxies

Published online by Cambridge University Press:  04 August 2017

R. H. Sanders ,
P. J. Teuben  and
G. D. van Albada
R. H. Sanders
Affiliation:
Kapteyn Astronomical Institute University of Groningen, the Netherlands
P. J. Teuben
Affiliation:
Kapteyn Astronomical Institute University of Groningen, the Netherlands
G. D. van Albada
Affiliation:
Kapteyn Astronomical Institute University of Groningen, the Netherlands

Extract

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One purpose for studying the gas flow in barred spiral galaxies is to use the observed distribution and kinematics of the gas as a tracer of the underlying gravitational field. By comparing model hydrodynamical calculations with observations of actual systems, one would like to define three basic properties of barred galaxies:

  1. 1) The bar strength. How significant is the deviation from axial symmetry in the region of the bar, measured by some parameter such as qt, maximum aximuthal force in terms of the mean radial force (Sanders and Tubbs, 1980).

  2. 2) The mean radial distribution of matter. Clearly in a system with large deviations from circular motion, the “rotation curve” gives no direct information on the radial mass distribution.

  3. 3) The angular velocity of the bar. Where is the co-rotation radius (or Lagrange points) with respect to the bar axes? Are other principal resonances present?

Type
IV. Barred Galaxies
Information
Symposium - International Astronomical Union , Volume 100: Internal Kinematics and Dynamics of Galaxies , 1983 , pp. 221 - 224
Copyright
Copyright © Reidel 1983 

References

Albada, T.S. van, Sanders, R.H.: 1982, M.N.R.A.S. 200 (in press).Google Scholar
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Sanders, R.H., Tubbs, A.D.: 1980, Astrophys. J. 235, 803.CrossRefGoogle Scholar
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