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If it does not kill them, it makes them stronger: collisional evolution of star clusters with tidal shocks

Gieles, M and Renaud, F (2017) If it does not kill them, it makes them stronger: collisional evolution of star clusters with tidal shocks Monthly Notices of the Royal Astronomical Society.

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Abstract

The radii of young (. 100 Myr) star clusters correlate only weakly with their masses. This shallow relation has been used to argue that impulsive tidal perturbations, or ‘shocks’, by passing giant molecular clouds (GMCs) preferentially disrupt low-mass clusters. We show that this mass-radius relation is in fact the result of the combined effect of two-body relaxation and repeated tidal shocks. Clusters in a broad range of environments including those like the solar neighbourhood evolve towards a typical radius of a few parsecs, as observed, independent of the initial radius. This equilibrium mass-radius relation is the result of a competition between expansion by relaxation and shrinking due to shocks. Interactions with GMCs are more disruptive for low-mass clusters, which helps to evolve the globular cluster mass function (GCMF). However, the properties of the interstellar medium in high-redshift galaxies required to establish a universal GCMF shape are more extreme than previously derived, challenging the idea that all GCs formed with the same power-law mass function.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Gieles, MUNSPECIFIEDUNSPECIFIED
Renaud, FUNSPECIFIEDUNSPECIFIED
Date : 12 February 2017
Copyright Disclaimer : This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords : ISM: structure – globular clusters: general – open clusters and associations: general – stars: kinematics and dynamics
Depositing User : Symplectic Elements
Date Deposited : 12 Aug 2016 16:21
Last Modified : 16 Sep 2016 15:46
URI: http://epubs.surrey.ac.uk/id/eprint/811701

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