Star Clusters in M31: Old Clusters with Bar Kinematics

We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high signal-to-noise Hectospec data. The data are well suited for analysis of M31's inner regions because we took particular care to correct for contamination by unresolved f...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2011-01, Vol.726 (1), p.L9-jQuery1323918690942='47'
Main Authors: Morrison, Heather, Caldwell, Nelson, Schiavon, Ricardo P, Athanassoula, E, Romanowsky, Aaron J, Harding, Paul
Format: Article
Language:English
Subjects:
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
GALAXIES
Sciences of the Universe
STAR CLUSTERS
VELOCITY
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Summary:We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high signal-to-noise Hectospec data. 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 that 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 x 2 family of bar periodic orbits, arguing for the existence of an inner Lindblad resonance in M31.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/726/1/L9