Star Clusters in M31: Old Clusters with Bar Kinematics

Details Star Clusters in M31: Old Clusters with Bar Kinematics Star Clusters in M31: Old Clusters with Bar Kinematics

2010-11-09

arxiv.org/abs/1011.2232v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

ApJ Letters, in press. 5 pages, 2 figures

Scientific paper

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.

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