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Testing lowered isothermal models with direct N-body simulations of globular clusters - II. Multimass models

Peuten, Miklos, Zocchi, A and Gieles, Mark (2017) Testing lowered isothermal models with direct N-body simulations of globular clusters - II. Multimass models Monthly Notices of the Royal Astronomical Society, 470 (3). pp. 2736-2761.

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Abstract

Lowered isothermal models, such as the multimass Michie–King models, have been successful in describing observational data of globular clusters. In this study, we assess whether such models are able to describe the phase space properties of evolutionary N-body models. We compare the multimass models as implemented in LIMEPY (Gieles & Zocchi) to N-body models of star clusters with different retention fractions for the black holes and neutron stars evolving in a tidal field. We find that multimass models successfully reproduce the density and velocity dispersion profiles of the different mass components in all evolutionary phases and for different remnants retention. We further use these results to study the evolution of global model parameters. We find that over the lifetime of clusters, radial anisotropy gradually evolves from the low- to the high-mass components and we identify features in the properties of observable stars that are indicative of the presence of stellar-mass black holes. We find that the model velocity scale depends on mass as m−δ, with δ ≃ 0.5 for almost all models, but the dependence of central velocity dispersion on m can be shallower, depending on the dark remnant content, and agrees well with that of the N-body models. The reported model parameters, and correlations amongst them, can be used as theoretical priors when fitting these types of mass models to observational data.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Peuten, Miklosm.peuten@surrey.ac.ukUNSPECIFIED
Zocchi, AUNSPECIFIEDUNSPECIFIED
Gieles, Markm.gieles@surrey.ac.ukUNSPECIFIED
Date : 1 May 2017
Identification Number : 10.1093/mnras/stx1311
Copyright Disclaimer : This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record: M. Peuten, A. Zocchi, M. Gieles, V. Hénault-Brunet; Testing lowered isothermal models with direct N-body simulations of globular clusters – II. Multimass models. Mon Not R Astron Soc 2017; 470 (3): 2736-2761. doi: 10.1093/mnras/stx1311 is available online at: https://academic.oup.com/mnras/article/470/3/2736/3860099/Testing-lowered-isothermal-models-with-direct-N
Uncontrolled Keywords : methods: numerical { stars: black holes {stars: kinematics and dynamics { globular clusters: general {galaxies: star clusters: general.
Depositing User : Melanie Hughes
Date Deposited : 19 Jul 2017 14:52
Last Modified : 19 Jul 2017 14:58
URI: http://epubs.surrey.ac.uk/id/eprint/841709

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