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

Armijo, Joaquin and Baugh, Carlton M and Padilla, Nelson D and Norberg, Peder and Arnold, Christian (2022) 'Making use of sub-resolution haloes in N-body simulations.', Monthly notices of the Royal Astronomical Society: letters., 510 (1). pp. 29-33.


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.

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Publisher 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.
Date accepted:02 November 2021
Date deposited:10 May 2022
Date of first online publication:26 November 2021
Date first made open access:10 May 2022

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