Wednesday, April 29, 2009 - 3:15pm
Ingo Berentzen (ITA):
"Evolution of disc galaxies in cosmological dark matter halos"
Abstract. We examine the bar instability in galaxy models to understand the importance of disk-halo coupling in the evolution of disc galaxies over comological timescales. We examine various properties of the bar and its evolution as a function of numerical resolution, using a sequence of N-body models ranging from 1.8K to 18M particles in the disk and 10K to 100M particles in the halo. Here, we focus on the transfer of angular momentum from the disk to the dark halo as well as possible destruction of the cusp in the dark matter halo as proposed recently. We also examine the detailed orbital structure of the disk at different stages as a test of numerical convergence.