论文标题

集群数计数和两点相关的组合:模拟黑暗能源调查的验证

Combination of cluster number counts and two-point correlations: Validation on Mock Dark Energy Survey

论文作者

To, C., Krause, E., Rozo, E., Wu, H., Gruen, D., DeRose, J., Rykoff, E. S., Wechsler, R. H., Becker, M. R., Costanzi, M., Eifler, T., Pereira, M. E. S., Kokron, N.

论文摘要

我们提出了一种结合群集丰度和大规模两点相关的方法,即星系聚类,星系 - 群集互相关,群集自动相关和群集镜头。该数据向量产生的宇宙学限制与依赖于小规模群集镜头进行质量校准的传统分析。我们使用旨在类似于暗能量调查的第一年(DES-Y1)数据的宇宙学调查模拟来验证分析协方差矩阵和参数推断。从模拟分析分析的后验分布在统计学上与在DES Y1实验的精确度上检测到的系统偏差一致。我们将模拟中的$χ^2 $值与他们的期望进行了比较,没有明显的差异。我们的结果对各种系统效应的鲁棒性通过对1年类似1类数据向量的模拟可能性分析来验证各种系统效应。这项工作介绍了对星系目录层仿真的群集丰度分析的第一个端到端验证。

We present a method of combining cluster abundances and large-scale two-point correlations, namely galaxy clustering, galaxy--cluster cross-correlations, cluster auto-correlations, and cluster lensing. This data vector yields comparable cosmological constraints to traditional analyses that rely on small-scale cluster lensing for mass calibration. We use cosmological survey simulations designed to resemble the Dark Energy Survey Year One (DES-Y1) data to validate the analytical covariance matrix and the parameter inferences. The posterior distribution from the analysis of simulations is statistically consistent with the absence of systematic biases detectable at the precision of the DES Y1 experiment. We compare the $χ^2$ values in simulations to their expectation and find no significant difference. The robustness of our results against a variety of systematic effects is verified using a simulated likelihood analysis of a Dark Energy Survey Year 1-like data vectors. This work presents the first-ever end-to-end validation of a cluster abundance cosmological analysis on galaxy catalog-level simulations.

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