Star Clusters in M31: Old Clusters with Bar Kinematics

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.

ApJ Letters, in press. 5 pages, 2 figures

References in corpus (5)

• Star Clusters in M31: I. A Catalog and a Study of the Young Clusters
• Unravelling the mystery of the M31 bar
• The proper motion of the Arches cluster with Keck Laser-Guide Star Adaptive Optics
• Unveiling the Boxy Bulge and Bar of the Andromeda Spiral Galaxy
• The Star Formation Histories of the Bulge and Disk of M31 from Gemini North+NIRI/Altair and HST/NICMOS

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