arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10757astro-ph.CO
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簇数计数和两点相关的组合:模拟暗能量巡天的验证

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

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

摘要:

我们提出了一种方法相结合的集群丰度和大规模的两点相关性,即星系聚类,星系团的互相关,集群自相关性,和集群透镜。这个数据向量产生可比的宇宙学约束传统的分析,依赖于小规模集群透镜质量校准。我们使用宇宙学调查模拟设计类似于暗能量调查第一年(DES-Y1)的数据,以验证分析协方差矩阵和参数推断。模拟分析的后验分布在统计学上与DES Y1实验精密度下可检测到的系统偏倚的缺失一致。我们将模拟中的$χ^2$值与其预期值进行比较,未发现显著差异。我们的结果对各种系统的影响的鲁棒性进行了验证,使用模拟似然分析的暗能量调查1年的数据向量。这项工作提出了有史以来第一个端到端的验证星系目录级模拟的星系团丰度宇宙学分析。

英文摘要:

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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