团簇标度关系中的非高斯散射
Non-Gaussian Scatter in Cluster Scaling Relations
摘要：
我们研究了非高斯散射在星系团质量可观测标度关系中对大面积巡天探测到的星系团质量和红移分布的影响。我们通过将三阶矩和四阶矩（偏度和峰度）合并到分布P（Mobs）中来参数化非高斯散射|M）。我们证明，对于低散射质量代理的高阶矩不显着影响所观察到的集群质量和红移分布。然而，对于高散射质量的指示物，测量极限质量阈值必须小于10^14 h^-1 Msol，以防止偏度对观测到的数计数产生重大影响，特别是在高红移时。我们还表明，一个未知的非高斯水平的分散相当于一个额外的不确定性的方差P（MOBS| M），并因此可能限制可以对状态参数w的暗能量方程施加的约束。此外，正的偏度在高质量端使质量函数变小，因此还必须考虑P（Mobs）中的偏度|M）当使用质量函数的形状来约束集群缩放关系时。
英文摘要：
We investigate the impact of non-Gaussian scatter in the cluster mass-observable scaling relation on the mass and redshift distribution of clusters detected by wide area surveys. We parameterize non-Gaussian scatter by incorporating the third and forth moments (skewness and kurtosis) into the distribution P(Mobs|M). We demonstrate that for low scatter mass proxies the higher order moments do not significantly affect the observed cluster mass and redshift distributions. However, for high scatter mass indicators it is necessary for the survey limiting mass threshold to be less than 10^14 h^-1 Msol to prevent the skewness from having a significant impact on the observed number counts, particularly at high redshift. We also show that an unknown level of non-Gaussianity in the scatter is equivalent to an additional uncertainty on the variance in P(Mobs|M) and thus may limit the constraints that can be placed on the dark energy equation of state parameter w. Furthermore, positive skewness flattens the mass function at the high mass end, and so one must also account for skewness in P(Mobs|M) when using the shape of the mass function to constrain cluster scaling-relations.
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