Bar instabilities in disk galaxies: the role of the triaxial halo
Anna Curir 1 and
Paola Mazzei 2
Received 20 May 1999 / Accepted 30 September 1999
We investigate the growth of bar instabilities inside a stellar-gaseous disk using a smooth particle hydrodynamics code. We carried out several simulations embedding the disk inside dark matter haloes with different masses, shapes and different dynamical states. We aim to focus on the role of a non axisymmetric halo and its evolution on the bar triggering. Our approach allows us to follow, for the first time in a self-consistent way, the effects of a live halo on the disk evolution. We point out that a massive halo not yet relaxed has a major role in triggering such an instability. Moreover, a relaxed halo with the same mass as that of the disk cannot avoid bar instability lasting at least 1 Gyr.
Key words: galaxies: halos galaxies: evolution galaxies: kinematics and dynamics galaxies: spiral galaxies: structure
Send offprint requests to: A. Curir
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© European Southern Observatory (ESO) 1999
Online publication: November 23, 1999