STAR CLUSTERS IN M31: OLD CLUSTERS WITH BAR KINEMATICS

被引：9
|
作者：
Morrison, Heather [1 ]
Caldwell, Nelson [2 ]
Schiavon, Ricardo P. [3 ]
Athanassoula, E. [4 ]
Romanowsky, Aaron J. [5 ]
Harding, Paul [1 ]
机构：
[1] Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA
[2] Ctr Astrophys, Cambridge, MA 02138 USA
[3] Gemini Observ, Hilo, HI 96720 USA
[4] Univ Aix Marseille 1, CNRS, UMR6110, LAM OAMP, F-13388 Marseille 13, France
[5] Univ Calif Santa Cruz, Lick Observ, UCO, Santa Cruz, CA 95064 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 726卷 / 01期
关键词：
galaxies: individual (M31); galaxies: kinematics and dynamics; galaxies: star clusters: general; galaxies: star clusters: individual; globular clusters: general; EXTRAGALACTIC GLOBULAR-CLUSTERS; GALACTIC BULGE; GALAXY; SYSTEM; DISK; HISTORIES; MODEL; FIELD; GAS; I;
D O I：
10.1088/2041-8205/726/1/L9
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：4
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