改进红移空间畸变的建模-- II。一个覆盖大小尺度的成对速度模型
Improving the modelling of redshift-space distortions - II. A pairwise velocity model covering large and small scales
摘要：
我们开发了一个模型的红移空间关联函数，适用于暗物质粒子和晕尺度$>5\,h^{-1}$ Mpc。在其最简单的配方，该模型需要的视线成对速度分布的前三个时刻的知识，加上两个定义良好的无量纲参数。该模型是通过扩展高斯-高斯处方的速度分布，在以前的论文中开发的，一个更一般的概念，允许局部偏度，这是需要匹配模拟。我们比较该模型与著名的高斯流模型和最近的Edgeworth流模型。使用N体模拟作为参考，我们表明，我们的模型给出了一个精确的描述红移空间集群在更广泛的尺度。我们不讨论计算速度矩的理论公式，把这个问题留给进一步的研究。
英文摘要：
We develop a model for the redshift-space correlation function, valid for both dark matter particles and halos 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 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.
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