Dynamical effects of the long bar in the Milky Way

Details Dynamical effects of the long bar in the Milky Way Dynamical effects of the long bar in the Milky Way

2008-08-04

arxiv.org/abs/0808.0498v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures. To appear in the online proceedings of IAU symposium 254 - The Galaxy Disk in Cosmological Context. Uses i

Scientific paper

We examine the dynamical effects on disk stars of a "long bar" in the Milky Way by inserting a triaxial rotating bar into an axisymmetric disk+bulge+dark halo potential and integrating 3-D orbits of 104 tracer stars over a period of 2 Gyr. The long bar has been detected via "clump giants" in the IR by Lopez-Corredoira et al. (2007), and is estimated to have semi-major axes of (3.9 : 0.6 : 0.1) kpc and a mass of 6 10^9 Msun. We find such a structure has a slight impact on the inner disk-system, moving tracers near to the bar into the bar-region, as well as into the bulge. These effects are under continuing study.

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