On spiral waves in galaxies - A gas dynamic approach

Physics – Fluid Dynamics

Scientific paper

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Astronomical Models, Galactic Structure, Gas Dynamics, Mathematical Models, Spiral Galaxies, Stellar Systems, Wave Propagation, Asymptotic Methods, Disks (Shapes), Early Stars, Feedback, Gravitational Fields, Interstellar Gas, Magnetic Fields, Schroedinger Equation, Synchrotron Radiation

Scientific paper

The feedback mechanism essential to the maintenance of trailing spiral waves in a galactic disk is examined by using a gas dynamical model, since it is generally expected that the dynamical mechanisms near the corotation resonance are quite similar in stellar systems and in gaseous systems. The purpose of the paper is partly expository; thus introductory material is presented for the benefit of readers unfamiliar with current literature in the subject of density waves in galaxies. Relatively simple approximate equations governing the density variations are obtained for both cylindrical systems and disk systems. It is shown that by a simple transformation the approximate equations in the two cases can be brought into similar form, although there are naturally still differences in the physical interpretation of the results. Among the phenomena studied on the basis of the approximate formation are the interaction of waves near the corotation circle and the initiation of density waves by a bar-like potential.

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