A dynamical model for the globular cluster G1

Baumgardt, Holger, Makino, Junichro, Hut, Piet, McMillan, Steve and Zwart, Simon Portegies (2003) A dynamical model for the globular cluster G1. Astrophysical Journal, 589 1: L25-L28. doi:10.1086/375802

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Author Baumgardt, Holger
Makino, Junichro
Hut, Piet
McMillan, Steve
Zwart, Simon Portegies
Title A dynamical model for the globular cluster G1
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
1538-4357
Publication date 2003-05
Sub-type Article (original research)
DOI 10.1086/375802
Open Access Status File (Publisher version)
Volume 589
Issue 1
Start page L25
End page L28
Total pages 4
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Formatted abstract
We present a comparison between the observational data on the kinematical structure of G1 in M31, obtained with the Hubble Space Telescope Wide Field Planetary Camera 2 and Space Telescope Imaging Spectrograph instruments, and the results of dynamical simulations carried out using the special purpose computer GRAPE-6. We have obtained good fits for models starting from single-cluster King model initial conditions and even better fits when starting our simulations with a dynamically constructed merger product of two star clusters. In the latter case, the results from our simulations are in excellent agreement with the observed profiles of luminosity, velocity dispersion, rotation, and ellipticity. We obtain a mass-to-light ratio of M/L = 4.0 ± 0.4 and a total cluster mass of M = (8 ± 1) × 106 M. Given that our dynamical model can fit all available observational data very well, there seems to be no need to invoke the presence of an intermediate-mass black hole in the center of G1.
Keyword Black hole physics
Globular clusters : individual (G1)
Methods : n-body simulations
Stellar dynamics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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