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The assembly bias of dark matter haloes to higher orders

Angulo, R.E.; Baugh, C.M.; Lacey, C.G.

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R.E. Angulo


We use an extremely large volume (2.4 h−3Gpc3), high-resolution N-body simulation to measure the higher order clustering of dark matter haloes as a function of mass and internal structure. As a result of the large simulation volume and the use of a novel ‘cross-moment’ counts-in-cells technique which suppresses discreteness noise, we are able to measure the clustering of haloes corresponding to rarer peaks than was possible in previous studies; the rarest haloes for which we measure the variance are 100 times more clustered than the dark matter. We are able to extract, for the first time, halo bias parameters from linear up to fourth order. For all orders measured, we find that the bias parameters are a strong function of mass for haloes more massive than the characteristic mass M*. Currently, no theoretical model is able to reproduce this mass dependence closely. We find that the bias parameters also depend on the internal structure of the halo up to fourth order. For haloes more massive than M*, we find that the more concentrated haloes are more weakly clustered than the less concentrated ones. We see no dependence of clustering on concentration for haloes with masses M < M*; this is contrary to the trend reported in the literature when segregating haloes by their formation time. Our results are insensitive to whether haloes are labelled by the total mass returned by the friends-of-friends group finder or by the mass of the most massive substructure. This implies that our conclusions are not an artefact of the particular choice of group finding algorithm. Our results will provide important input to theoretical models of galaxy clustering.


Angulo, R., Baugh, C., & Lacey, C. (2008). The assembly bias of dark matter haloes to higher orders. Monthly Notices of the Royal Astronomical Society, 387(2), 921-932.

Journal Article Type Article
Publication Date Jun 21, 2008
Deposit Date Jan 31, 2012
Publicly Available Date Jan 29, 2015
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 387
Issue 2
Pages 921-932
Keywords Methods: numerical, Galaxies: haloes, Cosmology: theory, Dark matter.


Published Journal Article (517 Kb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2008 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.

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