PROPER MOTIONS AND INTERNAL DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER M71

被引：2

作者：

Samra, Raminder S. ^{[1
]}

Richer, Harvey B. ^{[1
]}

Heyl, Jeremy S. ^{[1
]}

Goldsbury, Ryan ^{[1
]}

Thanjavur, Karun ^{[2
]}

Walker, Gordon ^{[1
]}

Woodley, Kristin A. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[2] Canada France Hawaii Telescope Corp, Waimea, HI 96743 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 751卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

astrometry; globular clusters: individual (M71; NGC; 6838); methods: data analysis; stars: kinematics and dynamics; MASS BLACK-HOLE; SPACE-TELESCOPE PHOTOMETRY; ACS SURVEY; OMEGA-CENTAURI; STAR-CLUSTERS; G1;

D O I：

10.1088/2041-8205/751/1/L12

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have used Gemini North together with the NIRI-ALTAIR adaptive optics imager in the H and K bands to explore the core of the Galactic globular cluster M71 (NGC 6838). We obtained proper motions for 217 stars and have resolved its internal proper motion dispersion. Using a 3.8 year baseline, the proper motion dispersion in the core is found to be 179 +/- 17 mu as yr(-1). We find no evidence of anisotropy in the motions and no radial variation in the proper motions with respect to distance from the cluster center. We also set an upper limit on any central black hole to be similar to 150 M-circle dot at 90% confidence level.

引用

页数：5

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