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Halo concentrations from extended Press-Schechter merger histories.

Benson, Andrew J. and Ludlow, Aaron and Cole, Shaun (2019) 'Halo concentrations from extended Press-Schechter merger histories.', Monthly notices of the Royal Astronomical Society., 485 (4). pp. 5010-5020.


We apply the model relating halo concentration to formation history proposed by Ludlow et al. to merger trees generated using an algorithm based on excursion set theory. We find that while the model correctly predicts the median relation between halo concentration and mass, it underpredicts the scatter in concentration at fixed mass. Since the same model applied to N-body merger trees predicts the correct scatter, we postulate that the missing scatter is due to the lack of any environmental dependence in merger trees derived from excursion set theory. We show that a simple modification to the merger tree construction algorithm, which makes merger rates dependent on environment, can increase the scatter by the required amount, and simultaneously provide a qualitatively correct correlation between environment and formation epoch in the excursion set merger trees.

Item Type:Article
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Publisher statement:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:21 February 2019
Date deposited:12 March 2019
Date of first online publication:08 March 2019
Date first made open access:No date available

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