Perturbation configurations in a two-fluid system of singular isothermal disks

Details Perturbation configurations in a two-fluid system of singular isothermal disks Perturbation configurations in a two-fluid system of singular isothermal disks

2003-04-15

arxiv.org/abs/astro-ph/0304270v2

Mon.Not.Roy.Astron.Soc. 343 (2003) 750

Astronomy and Astrophysics

Astrophysics

23 pages, 16 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06710.x

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.

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