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

Published online by Cambridge University Press:  12 April 2016

Benjamin J. Weiner
Affiliation:
Dept. of Physics and Astronomy, Rutgers University, Piscataway NJ 08855
T. B. Williams
Affiliation:
Dept. of Physics and Astronomy, Rutgers University, Piscataway NJ 08855
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Abstract

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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/LI 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 L1 (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.

Type
Posters of Part VII and Part VIII
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Athanassoula, E. 1992, MNRAS, 259, 345 CrossRefGoogle Scholar
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Prendergast, K. 1983, in Internal Kinematics and Dynamics of Galaxies, Athanassoula, E., Dordrecht: Reidel, 215 CrossRefGoogle Scholar
van Albada, G.D. 1985, in The Milky Way Galaxy,Woerden, H.van, Allen, R.J., & Burton, W.B., Dordrecht: Reidel, 547 CrossRefGoogle Scholar
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