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Making use of sub-resolution haloes in N-body simulations

Armijo, Joaquin; Baugh, Carlton M; Padilla, Nelson D; Norberg, Peder; Arnold, Christian

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Joaquin Armijo

Nelson D Padilla

Christian Arnold


Conservative mass limits are often imposed on the dark matter halo catalogues extracted from N-body simulations. By comparing simulations with different mass resolutions, at z = 0 we find that even for haloes resolved by 100 particles, the lower resolution simulation predicts a cumulative halo abundance that is 5 per cent lower than in the higher resolution simulation. We propose a simple weighting scheme to utilize the haloes that are usually regarded as being ‘sub-resolution’. With the scheme, we are able to use haloes which contain only 11 particles to reproduce the clustering measured in the higher resolution simulation to within 5 per cent on scales down to 2 h−1 Mpc, thereby extending the useful halo resolution by a factor of 10 below the mass at which the mass functions in the two simulations first start to deviate. The performance of the method is slightly worse at higher redshift. Our method allows a simulation to be used to probe a wider parameter space in clustering studies, for example, in a halo occupation distribution analysis. This reduces the cost of generating many simulations to estimate the covariance matrix on measurements or using a larger volume simulation to make large-scale clustering predictions.


Armijo, J., Baugh, C. M., Padilla, N. D., Norberg, P., & Arnold, C. (2022). Making use of sub-resolution haloes in N-body simulations. Monthly Notices of the Royal Astronomical Society, 510(1), 29-33.

Journal Article Type Article
Acceptance Date Nov 2, 2021
Online Publication Date Nov 26, 2021
Publication Date 2022-02
Deposit Date May 10, 2022
Publicly Available Date May 10, 2022
Journal Monthly Notices of the Royal Astronomical Society: Letters
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 510
Issue 1
Pages 29-33


Published Journal Article (777 Kb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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