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Halo concentrations from extended Press-Schechter merger histories

Benson, Andrew J; Ludlow, Aaron; Cole, Shaun

Halo concentrations from extended Press-Schechter merger histories Thumbnail


Authors

Andrew J Benson

Aaron Ludlow



Abstract

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.

Citation

Benson, A. J., Ludlow, A., & Cole, S. (2019). Halo concentrations from extended Press-Schechter merger histories. Monthly Notices of the Royal Astronomical Society, 485(4), 5010-5020. https://doi.org/10.1093/mnras/stz695

Journal Article Type Article
Acceptance Date Feb 21, 2019
Online Publication Date Mar 8, 2019
Publication Date Jun 30, 2019
Deposit Date Mar 12, 2019
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 485
Issue 4
Pages 5010-5020
DOI https://doi.org/10.1093/mnras/stz695

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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.






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