Bar instabilities in disk galaxies: the role of the triaxial halo

Details Bar instabilities in disk galaxies: the role of the triaxial halo Bar instabilities in disk galaxies: the role of the triaxial halo

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...352..103c&link_type=abstract

Astronomy and Astrophysics, v.352, p.103-111 (1999)

Astronomy and Astrophysics

Astrophysics

16

Galaxies: Halos, Galaxies: Evolution, Galaxies: Kinematics And Dynamics, Galaxies: Spiral, Galaxies: Structure

Scientific paper

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.

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