Long-term evolution of initially unvirialized, clumpy, mass-segregated star clusters in tidal fields

L. J. Rossi, J. R. Hurley, K. Bekki

Research output: Contribution to journalArticle

Abstract

Star clusters can form in highly substructured configurations, possibly unvirialized and possibly with a primordial degree of mass segregation. None the less, a common assumption of many N-body simulations of star clusters is that the clusters are initially spherical, homogeneous and in virial equilibrium. The impact of the choice of the initial conditions on the long-term evolution of the clusters is unclear, considering also that the tidal field plays an important role in setting the mass-loss rate and size of dynamically evolved objects. We present a series direct N-body simulations of star clusters spanning a range of initial degree of clumpiness, virial state and mass segregation and following different trajectories in a realistic galactic tidal field. The results suggest that, even if the choice of the initial conditions has a non-negligible impact, the long-term evolution of a star cluster seems to be dominated by the tidal forces experienced along its trajectory in the host galaxy.

Original languageEnglish
Pages (from-to)4441-4449
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume468
Issue number4
DOIs
Publication statusPublished - Jul 2017

Cite this

@article{638c1b0e0bf5457b831d3b8842b42db0,
title = "Long-term evolution of initially unvirialized, clumpy, mass-segregated star clusters in tidal fields",
abstract = "Star clusters can form in highly substructured configurations, possibly unvirialized and possibly with a primordial degree of mass segregation. None the less, a common assumption of many N-body simulations of star clusters is that the clusters are initially spherical, homogeneous and in virial equilibrium. The impact of the choice of the initial conditions on the long-term evolution of the clusters is unclear, considering also that the tidal field plays an important role in setting the mass-loss rate and size of dynamically evolved objects. We present a series direct N-body simulations of star clusters spanning a range of initial degree of clumpiness, virial state and mass segregation and following different trajectories in a realistic galactic tidal field. The results suggest that, even if the choice of the initial conditions has a non-negligible impact, the long-term evolution of a star cluster seems to be dominated by the tidal forces experienced along its trajectory in the host galaxy.",
keywords = "gravitation, methods: numerical, galaxies: star clusters: general, galaxies: structure, EARLY DYNAMICAL EVOLUTION, YOUNG STELLAR CLUSTERS, GLOBULAR-CLUSTERS, GALAXY MERGERS, MOLECULAR CLOUDS, BROWN DWARFS, SYSTEMS, SUBSTRUCTURE, SIMULATIONS, DISRUPTION",
author = "Rossi, {L. J.} and Hurley, {J. R.} and K. Bekki",
year = "2017",
month = "7",
doi = "10.1093/mnras/stx663",
language = "English",
volume = "468",
pages = "4441--4449",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS UNITED KINGDOM",
number = "4",

}

Long-term evolution of initially unvirialized, clumpy, mass-segregated star clusters in tidal fields. / Rossi, L. J.; Hurley, J. R.; Bekki, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 468, No. 4, 07.2017, p. 4441-4449.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Long-term evolution of initially unvirialized, clumpy, mass-segregated star clusters in tidal fields

AU - Rossi, L. J.

AU - Hurley, J. R.

AU - Bekki, K.

PY - 2017/7

Y1 - 2017/7

N2 - Star clusters can form in highly substructured configurations, possibly unvirialized and possibly with a primordial degree of mass segregation. None the less, a common assumption of many N-body simulations of star clusters is that the clusters are initially spherical, homogeneous and in virial equilibrium. The impact of the choice of the initial conditions on the long-term evolution of the clusters is unclear, considering also that the tidal field plays an important role in setting the mass-loss rate and size of dynamically evolved objects. We present a series direct N-body simulations of star clusters spanning a range of initial degree of clumpiness, virial state and mass segregation and following different trajectories in a realistic galactic tidal field. The results suggest that, even if the choice of the initial conditions has a non-negligible impact, the long-term evolution of a star cluster seems to be dominated by the tidal forces experienced along its trajectory in the host galaxy.

AB - Star clusters can form in highly substructured configurations, possibly unvirialized and possibly with a primordial degree of mass segregation. None the less, a common assumption of many N-body simulations of star clusters is that the clusters are initially spherical, homogeneous and in virial equilibrium. The impact of the choice of the initial conditions on the long-term evolution of the clusters is unclear, considering also that the tidal field plays an important role in setting the mass-loss rate and size of dynamically evolved objects. We present a series direct N-body simulations of star clusters spanning a range of initial degree of clumpiness, virial state and mass segregation and following different trajectories in a realistic galactic tidal field. The results suggest that, even if the choice of the initial conditions has a non-negligible impact, the long-term evolution of a star cluster seems to be dominated by the tidal forces experienced along its trajectory in the host galaxy.

KW - gravitation

KW - methods: numerical

KW - galaxies: star clusters: general

KW - galaxies: structure

KW - EARLY DYNAMICAL EVOLUTION

KW - YOUNG STELLAR CLUSTERS

KW - GLOBULAR-CLUSTERS

KW - GALAXY MERGERS

KW - MOLECULAR CLOUDS

KW - BROWN DWARFS

KW - SYSTEMS

KW - SUBSTRUCTURE

KW - SIMULATIONS

KW - DISRUPTION

U2 - 10.1093/mnras/stx663

DO - 10.1093/mnras/stx663

M3 - Article

VL - 468

SP - 4441

EP - 4449

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -