Perturbation configurations in a two-fluid system of singular isothermal disks
arXiv:astro-ph/0304270 · doi:10.1046/j.1365-8711.2003.06710.x
Abstract
We investigate properties of stationary aligned and unaligned spiral perturbation configurations in a composite system of gravitationally coupled stellar and gaseous singular isothermal disks (SIDs) using the two-fluid formalism. We obtain stationary perturbation solutions for aligned and unaligned spiral logarithmic configurations in such a composite SID system and derive analytically existence criteria for these solutions. In comparison with the similar problem of a single SID studied by Shu et al. (2000), there are now two possible sets of solutions owing to an additional SID.
23 pages, 16 figures, accepted by MNRAS