Sph Gas Response To Barred Perturbations

Abstract

We present the results of a series of SPH simulations, in which we follow the response of a gaseous disk to an imposed barred potential. The shock morphology depends on the assumed potential. Their longevity and their thinness, however, depend on features of the interstellar medium, such as the sound speed and the viscosity. Our calculations underline the importance of gas recycling. 1 Introduction Dust lanes along the leading edges of bars are encountered in many spiral galaxies, such as NGC 1300, NGC 1365 etc. Their morphology, however, varies from one case to another ([1]). Both observational and theoretical evidence has shown that they are the loci of shocks (see [3] and references therein). The relation between the existence (and the morphology) of these shocks and the topology of the stable periodic orbits, has been discussed in [3], where a flux-splitting second order scheme ([8]) has been used. One of our goals ([4]) is to compare the response of a gaseous disk to a given barr...