On the formation of spiral structure in gas discs through tidal interaction. I - Direct encounters

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Astronomical Models, Cosmic Gases, Disk Galaxies, Spiral Galaxies, Tidal Waves, Wave Propagation, Galactic Evolution, Gas Density, Isothermal Flow, Pitch (Inclination), Wave Fronts, Waveforms

Scientific paper

This paper investigates the waves which are formed when a thin gas disc in a smooth axisymmetric potential is perturbed. The perturbation is introduced through tidal interaction with an external body moving in the plane of the disc. The model is investigated using numerical techniques which follow the formation of large-scale hyperbolic spirals. These are identified as the propagating fronts of epicyclic waves. Over an area comparable to the visual image of a galaxy the spirals change from the hyperbolic form towards an equiangular appearance. Predictions by analytical models were found to be in good agreement with the results.

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