Excitation of density waves on ram-pressure-deformed galactic disks

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Astronomical Models, Deformation, Density Wave Model, Disk Galaxies, Dwarf Novae, Galactic Structure, Pressure Effects, Spiral Galaxies, Mathematical Models, Perturbation Theory, Resonance, Wave Excitation

Scientific paper

The excitation of spiral density waves on ram-pressure-deformed galactic disks is discussed. It is shown that excitation is possible by a mechanism similar to that known as tidal instability in dwarf nova systems. That is, a resonant interaction between a wave and the deformed part of the disk excites the wave. The so-called V-constant disks are considered. Then, although excitation of some wave modes is possible, the most prominent type is a tightly-wound one-armed retrograde wave.

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