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Astron. Astrophys. 352, 103-111 (1999)


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

Anna Curir 1 and Paola Mazzei 2

1 Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese (Torino), Italy
2 Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy

Received 20 May 1999 / Accepted 30 September 1999

Abstract

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

© European Southern Observatory (ESO) 1999

Online publication: November 23, 1999

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