We develop a model for the redshift-space correlation function, valid for both dark matter particles and haloes on scales > 5 h-1 Mpc. 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 streamingmodel. Using N-body simulations as a reference, we showthat 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.
Improving the modelling of redshift-space distortions - II. A pairwise velocity model covering large and small scales / D. Bianchi, W.J. Percival, J. Bel. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 463:4(2016), pp. 3783-3798. [10.1093/MNRAS/STW2243]
Improving the modelling of redshift-space distortions - II. A pairwise velocity model covering large and small scales
D. Bianchi;
2016
Abstract
We develop a model for the redshift-space correlation function, valid for both dark matter particles and haloes on scales > 5 h-1 Mpc. 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 streamingmodel. Using N-body simulations as a reference, we showthat 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.File | Dimensione | Formato | |
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