Generation of spiral density waves by bars in differentially rotating disks

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Density Wave Model, Galactic Rotation, Gas Density, Rotating Fluids, Spiral Galaxies, Angular Velocity, Barred Galaxies, Gravitational Fields, Perturbation Theory, Wave Propagation

Scientific paper

The excitation of spiral density waves by the gravitational field of a bar in a differentially rotating flat subsystem of a galaxy is considered. A numerical investigation is carried out on the unsteady nonlinear response of a differentially rotating gas disk to the potential of a bar with the form of a prolate ellipsoid of revolution for different relationships between the angular velocity of the bar and the rotation curve of the disk. A large scale trailing spiral pattern is excited if the bar rotates faster than the greater part of the disk, and a feature of the patterns is the appearance of ring structures. A quasisteady wave pattern is established if the potential of the bar is switched on sufficiently slowly.

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