Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233...67r&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 67-84.
Astronomy and Astrophysics
Astrophysics
249
Barred Galaxies, Density Wave Model, Galactic Evolution, Gas Dynamics, Shock Waves, Spiral Galaxies, Density Distribution, Flow Velocity, Gas Density, Gas Flow, Hydrodynamic Equations, Hydrodynamics, Interstellar Gas, Steady State
Scientific paper
Steady-state gasdynamical studies, previously limited to tightly wound normal spiral galaxies, are extended to models of barred spirals with a 5% to 10% perturbing potential. The models show that a strong wave manifestation is an important constituent of the bar structure in many barred spirals and that a density-wave shock wave can form a bar structure as pronounced as the narrow bars often evident in optical photographs of barred spirals. The dark narrow dust lanes often observed along the leading edges of bar structures are identified as tracers of shocks, and it is found that strong shocks along a bar structure during even a small part of a galaxy's lifetime might easily deplete a large enough proportion of the gas to cause a lack of gas in the inner annuli encompassing the bar by the time of the present epoch. It is emphasized that even moderate-amplitude barlike perturbations in the disk can drive large noncircular gas motions, typically 50 to 150 km/s.
Huntley Jonathan M.
Roberts William W. Jr.
van Albada G. D.
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