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arXiv 1504.01413astro-ph.CO
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从50个大质量星系团的Subaru弱透镜测量探测暗物质轮廓的普适性

Detection of universality of dark matter profile from Subaru weak lensing measurements of 50 massive clusters

Hiroko Niikura, Masahiro Takada, Nobuhiro Okabe, Rossella Martino, Ryuichi Takahashi

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20 pages, 17 figures, 1 table, matches the version that will appear in PASJ
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摘要：

我们开发了一种新的方法来测量集群的透镜畸变配置文件与堆叠的缩放幅度的背景星系椭圆作为缩放的中心半径的函数，根据NFW预测每个集群，基于假设不同的集群在一个样本中遵循的通用NFW配置文件。首先，我们证明了这种方法的可行性，使用分析NFW模型和模拟晕在高分辨率$N$体模拟。然后，我们应用，作为一个概念的证明，这种方法的斯巴鲁弱透镜数据和XMM/钱德拉X射线观测的样本中的50个大规模的集群的红移范围$0.15\le z\le 0.3$，他们的晕质量范围超过一个数量级。为了估计每个星系团的NFW参数，我们使用晕质量代理关系的X射线观测值，无论是基于流体静力学平衡或气体质量，然后推断模型$c(M)$关系的晕浓度。我们评估的NFW缩放分析的性能，通过测量50集群透镜配置文件相对于NFW的预测在一个范围内的半径，$0.14\le R/[h^{-1}{\rm Mpc}]\le 2.8$的散射。我们发现了一个4 - 6 $σ$水平的证据，在50个集群的通用NFW配置文件，为两个X射线晕质量代理关系，虽然气体质量似乎是一个更好的代理底层的真实质量。通过比较的测量与模拟集群透镜考虑到斯巴鲁数据中的固有星系形状的统计误差，我们认为，额外的晕质量误差或固有散射的$σ_{\ln M_{500c}}\sim 0.2$ - $0.3$可以调和测量和模拟之间的差异。

英文摘要：

We develop a novel method of measuring the lensing distortion profiles of clusters with stacking the scaled amplitudes of background galaxy ellipticities as a function of the scaled centric radius according to the NFW prediction of each cluster, based on the assumption that the different clusters in a sample follow the universal NFW profile. First we demonstrate the feasibility of this method using both the analytical NFW model and simulated halos in high-resolution $N$-body simulations. We then apply, as a proof of concept, this method to the Subaru weak lensing data and the XMM/Chandra X-ray observables for a sample of 50 massive clusters in the redshift range $0.15\le z\le 0.3$, where their halo masses range over an order of magnitude. To estimate the NFW parameters of each cluster, we use the halo mass proxy relation of X-ray observables, based on either the hydrostatic equilibrium or the gas mass, and then infer the halo concentration from the model $c(M)$ relation. We evaluate a performance of the NFW scaling analysis by measuring the scatters of 50 cluster lensing profiles relative to the NFW predictions over a range of radii, $0.14\le R/[h^{-1}{\rm Mpc}]\le 2.8$. We found a 4 - 6$σ$ level evidence of the universal NFW profile in 50 clusters, for both the X-ray halo mass proxy relations, although the gas mass appears to be a better proxy of the underlying true mass. By comparing the measurements with the simulations of cluster lensing taking into account the statistical errors of intrinsic galaxy shapes in the Subaru data, we argue that additional halo mass errors or intrinsic scatters of $σ_{\ln M_{500c}}\sim 0.2$ - $0.3$ could reconcile a difference between the measurements and the simulations.

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