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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(387), p. 921-932

DOI: 10.1111/j.1365-2966.2008.13304.x

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The assembly bias of dark matter haloes to higher orders.

Journal article published in 2008 by R. E. Angulo, C. M. Baugh, C. G. Lacey ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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