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

Abstract

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{sup -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 {approx}150 M{sub Sun} at 90% confidence level.

Authors:
; ; ; ; ;  [1];  [2]
  1. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada)
  2. Canada-France-Hawaii Corporation, Waimea, HI 96743-8432 (United States)
Publication Date:
OSTI Identifier:
22047812
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 751; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; ASTRONOMY; ASTROPHYSICS; BLACK HOLES; DATA ANALYSIS; DISTANCE; MILKY WAY; OPTICS; PROPER MOTION; STAR CLUSTERS; STARS; VARIATIONS

Citation Formats

Samra, Raminder S, Richer, Harvey B, Heyl, Jeremy S, Goldsbury, Ryan, Walker, Gordon, Woodley, Kristin A, and Thanjavur, Karun. PROPER MOTIONS AND INTERNAL DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER M71. United States: N. p., 2012. Web. doi:10.1088/2041-8205/751/1/L12.
Samra, Raminder S, Richer, Harvey B, Heyl, Jeremy S, Goldsbury, Ryan, Walker, Gordon, Woodley, Kristin A, & Thanjavur, Karun. PROPER MOTIONS AND INTERNAL DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER M71. United States. https://doi.org/10.1088/2041-8205/751/1/L12
Samra, Raminder S, Richer, Harvey B, Heyl, Jeremy S, Goldsbury, Ryan, Walker, Gordon, Woodley, Kristin A, and Thanjavur, Karun. 2012. "PROPER MOTIONS AND INTERNAL DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER M71". United States. https://doi.org/10.1088/2041-8205/751/1/L12.
@article{osti_22047812,
title = {PROPER MOTIONS AND INTERNAL DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER M71},
author = {Samra, Raminder S and Richer, Harvey B and Heyl, Jeremy S and Goldsbury, Ryan and Walker, Gordon and Woodley, Kristin A and Thanjavur, Karun},
abstractNote = {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{sup -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 {approx}150 M{sub Sun} at 90% confidence level.},
doi = {10.1088/2041-8205/751/1/L12},
url = {https://www.osti.gov/biblio/22047812}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 751,
place = {United States},
year = {Sun May 20 00:00:00 EDT 2012},
month = {Sun May 20 00:00:00 EDT 2012}
}