Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..133b&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 2, Sept. 1979, p. 133-135. Science Research Council
Astronomy and Astrophysics
Astrophysics
14
Density Wave Model, Disk Galaxies, Galactic Structure, Gas Flow, Gravitational Effects, Stellar Gravitation, Flow Distortion, Galactic Rotation, Gas Density, Hydrodynamics, Spiral Galaxies
Scientific paper
The steady state response of a self-gravitating gaseous disk to a mild stellar oval distortion over the whole of a model galaxy using a time-dependent two-dimensional, inviscid, pressureless hydrodynamic calculation is examined. In this model, a moderately open, trailing, steady bisymmetric gaseous density wave occurs between its principal Lindblad resonances. The wavenumber and pattern speed are unchanged when the gravitational potential of the gas is ignored and the flow is driven only by the stars. The bar-driven density wave has not become more tightly wound in this model by including the self-attraction of the gas. However, the peak amplitude of the density is nearly doubled by its inclusion. Thus, a self-gravitating gaseous disk can support significantly higher density contrasts across its spiral arms without the explicit inclusion of a shock wave.
Berman Robert H.
Hockney Roger W.
Pollard D. J.
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