Improving the modelling of redshift-space distortions - II. A pairwise velocity model covering large and small scales

Davide Bianchi, Will Percival, Julien Bel

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Abstract

We develop a model for the redshift-space correlation function, valid for both dark matter particles and halos on scales >5-1Mpc. In its simplest formulation, the model requires the knowledge of the first three moments of the line-of-sight pairwise velocity distribution plus two well-defined dimensionless parameters. The model is obtained by extending the Gaussian-Gaussianity prescription for the velocity distribution, developed in a previous paper, to a more general concept allowing for local skewness, which is required to match simulations. We compare the model with the well known Gaussian streaming model and the more recent Edgeworth streaming model. Using N-body simulations as a reference, we show that our model gives a precise description of the redshift-space clustering over a wider range of scales. We do not discuss the theoretical prescription for the evaluation of the velocity moments, leaving this topic to further investigation.
Original languageEnglish
Pages (from-to)3783-3798
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number4
Early online date7 Sep 2016
DOIs
Publication statusPublished - Dec 2016

Keywords

  • astro-ph.CO
  • cosmology: large-scale structure of the Universe
  • dark energy
  • theory
  • RCUK
  • STFC
  • ST/I001204/1

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