Star Clusters in M31: Old Clusters with Bar Kinematics
Cosmology and Nongalactic Astrophysics
2015-05-20 v1 Astrophysics of Galaxies
Abstract
We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high S/N Hectospec data (Caldwell et al 2010). The data are well suited for analysis of M31's inner regions because we took particular care to correct for contamination by unresolved field stars from the disk and bulge in the fibers. The metal poor clusters show kinematics which are compatible with a pressure-supported spheroid. The kinematics of metal-rich clusters, however, argue for a disk population. In particular the innermost region (inside 2 kpc) shows the kinematics of the x2 family of bar periodic orbits, arguing for the existence of an inner Lindblad resonance in M31.
Keywords
Cite
@article{arxiv.1011.2232,
title = {Star Clusters in M31: Old Clusters with Bar Kinematics},
author = {H. Morrison and N. Caldwell and R. Schiavon and E. Athanassoula and A. Romanowsky and P. Harding},
journal= {arXiv preprint arXiv:1011.2232},
year = {2015}
}
Comments
ApJ Letters, in press. 5 pages, 2 figures