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The Lives of High Redshift Mergers

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arxiv 1204.6319 v3 pith:2JMG44VD submitted 2012-04-27 astro-ph.CO astro-ph.GA

The Lives of High Redshift Mergers

classification astro-ph.CO astro-ph.GA
keywords mergerscosmologicalfindjiangmerger-timeanalysisapplicationsapproximation
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We present a comparative study of recent works on merger-timescales with dynamical friction and find a strong contrast between idealized/isolated mergers (Boylan-Kolchin et al. 2008) and mergers from a cosmological volume (Jiang et al. 2008). Our study measures the duration of mergers in a cosmological N-body simulation of dark matter, with emphasis on higher redshifts (z < 10) and a lower mass range. In our analysis we consider and compare two merger definitions; tidal disruption and coalescence. We find that the merger-time formula proposed by Jiang et al. (2008) describes our results well and conclude that cosmologically motivated merger-time formulae provide a more versatile and statistically robust approximation for practical applications such as semi-analytic/hybrid models.

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