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Modelling galaxy merger time-scales and tidal destruction.

Simha, Vimal and Cole, Shaun (2017) 'Modelling galaxy merger time-scales and tidal destruction.', Monthly notices of the Royal Astronomical Society., 472 (2). pp. 1392-1400.


We present a model for the dynamical evolution of subhaloes based on an approach combining numerical and analytical methods. Our method is based on tracking subhaloes in an N-body simulation up to the latest epoch that it can be resolved, and applying an analytic prescription for its merger time-scale that takes dynamical friction and tidal disruption into account. When applied to cosmological N-body simulations with mass resolutions that differ by two orders of magnitude, the technique produces halo occupation distributions that agree to within 3  per cent. This model has now been implemented in the GALFORM semi-analytic model of galaxy formation.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:27 July 2017
Date deposited:01 November 2017
Date of first online publication:02 August 2017
Date first made open access:01 November 2017

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