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Fabry-Perot Observations and Hydrodynamical Simulations of the Barred Spiral NGC 4123

  • Benjamin J. Weiner (a1), J. A. Sellwood and T. B. Williams (a1)

Abstract

We present Fabry-Perot observations of the velocity field of gas in the barred spiral NGC 4123, and 2-D hydrodynamical simulations of the gas flow in model potentials derived from I-band photometry. The simulated gas flow is quite sensitive to the details of the potential, which enables us to constrain parameters such as the M/L I of the bar and the bar pattern speed. The observations confirm that the dust lanes along the leading edges of the bar are the locations of shocks. Requiring models to produce shocks with the correct alignment constrains the Lagrange point L 1 (corotation) to be at a radius 1.1 – 1.4 times the semimajor axis of the bar, i.e. the bar is a fast rotator.

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Copyright

References

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Athanassoula, E. 1992, MNRAS, 259, 345
Duval, M.F. & Athanassoula, E. 1983, A&A, 121, 297
Prendergast, K. 1962, unpublished.
Prendergast, K. 1983, in Internal Kinematics and Dynamics of Galaxies, Athanassoula, E., Dordrecht: Reidel, 215
van Albada, G.D. 1985, in The Milky Way Galaxy,Woerden, H.van, Allen, R.J., & Burton, W.B., Dordrecht: Reidel, 547
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Proceedings of the International Astronomical Union
  • ISSN: -
  • EISSN: 0252-9211
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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