论文标题
来自星系群和群体中的宇宙学限制最终赤道深度调查
Cosmological Constraints from Galaxy Clusters and Groups in the eROSITA Final Equatorial Depth Survey
论文作者
论文摘要
我们介绍了$ EROSITA $集群样本的首次宇宙学研究，这些研究已在$ EROSITA $最终赤道深度调查（EFEDS）中鉴定出来。在X射线和光学可观察物的联合选择中，该样本包含$ 455 $的簇在0.1 <z <1.2 $ $ 0.1 <z <1.2 $的范围内，其中$ 177 $的系统由Hyper Soprime-CAM（HSC）调查的公共数据涵盖，可实现均匀的弱量子群质量约束。有了最小的假设，在每个集群红移$ z $中，我们以经验模型（1）群集晕质量质量和可观测值之间的缩放关系，其中包括X射线计数率，光学丰富度和弱透镜质量，以及（2）X射线的完整性选择，以完整性功能$ \ nathtt $ \ Mathtt {C c} $ {c} $。使用簇的丰富度分布，我们直接测量X射线完整性，并采用这些测量值作为$ \ Mathtt {C} $参数的信息知识。在盲目的分析中，我们获得了宇宙学的约束$ω_ {\ mathrm {m}} = 0.245^{+0.048} _ { - 0.058} $，$σ_{8} σ_{8} \ left（ω_ {\ Mathrm {m}}/0.3 \ right）^{0.3} = 0.791^{+0.028} _ { - 0.031} $在平面$λ$ cdmosology中。扩展到平面$ W $ CDM宇宙学会导致对$ W = -1.25 \ pm 0.47 $的暗能量的状态参数方程的限制。 EFEDS的约束与$ Planck $ Mission，Dark Energy调查的Galaxy-Galaxy镜头和聚类分析以及SPT-SZ调查的集群丰度分析的结果非常吻合。通过经验建模，这项工作介绍了基于广场X射线和弱透镜调查之间的协同作用的第一个完全自洽的宇宙学约束。
We present the first cosmological study of a sample of $eROSITA$ clusters, which were identified in the $eROSITA$ Final Equatorial Depth Survey (eFEDS). In a joint selection on X-ray and optical observables, the sample contains $455$ clusters within a redshift range of $0.1<z<1.2$, of which $177$ systems are covered by the public data from the Hyper Suprime-Cam (HSC) survey that enables uniform weak-lensing cluster mass constraints. With minimal assumptions, at each cluster redshift $z$ we empirically model (1) the scaling relations between the cluster halo mass and the observables, which include the X-ray count rate, the optical richness, and the weak-lensing mass, and (2) the X-ray selection in terms of the completeness function $\mathtt{C}$. Using the richness distribution of the clusters, we directly measure the X-ray completeness and adopt those measurements as informative priors for the parameters of $\mathtt{C}$. In a blinded analysis, we obtain the cosmological constraints $Ω_{\mathrm{m}} = 0.245^{+0.048}_{-0.058}$, $σ_{8} = 0.833^{+0.075}_{-0.063}$ and $S_{8} \equiv σ_{8}\left(Ω_{\mathrm{m}}/0.3\right)^{0.3}= 0.791^{+0.028}_{-0.031}$ in a flat $Λ$CDM cosmology. Extending to a flat $w$CDM cosmology leads to the constraint on the equation of state parameter of the dark energy of $w = -1.25\pm 0.47$. The eFEDS constraints are in good agreement with the results from the $Planck$ mission, the galaxy-galaxy lensing and clustering analysis of the Dark Energy Survey, and the cluster abundance analysis of the SPT-SZ survey at a level of $\lesssim1σ$. With the empirical modelling, this work presents the first fully self-consistent cosmological constraints based on a synergy between wide-field X-ray and weak lensing surveys.
