arXiv 1607.046862016-07-25astro-ph.CO

来自弛豫星系团的宇宙学和天体物理V：与冷暗物质结构形成的一致性

Cosmology and Astrophysics from Relaxed Galaxy Clusters V: Consistency with Cold Dark Matter Structure Formation

Adam B. Mantz, Steven W. Allen, R. Glenn Morris

备注：: 8 pages, to appear in MNRAS. Minor typos corrected in v2
发表信息：: Mon. Not. Roy. Astron. Soc. 462:681-688, 2016
DOI：: 10.1093/mnras/stw1707

摘要：

这是研究大质量、动态松弛的星系团的天体物理学和宇宙学的系列论文中的第五篇。我们的样本包括40个集群被确定为动态放松和热在本系列的论文I和II。在这里，我们使用的X射线数据的集群质量配置文件的约束条件，以测试一些基本的预测宇宙结构形成的冷暗物质（CDM）的范例。我们提出的浓度-质量关系的大规模集群的限制，发现一个幂律质量依赖的斜率为$κ_m=-0.16\pm0.07$，与CDM预测。对于这个放松的样品，关系是一致的常数作为红移的函数（幂律斜率与$1+z$的$κ_ζ=-0.17\pm0.26$），与$σ_{\ln c}=0.16\pm0.03$的内在散射。我们调查的数据（通常为$\sim50$千分之一秒差距-1百万分之一秒差距）探测的径向范围内的集群质量分布的形状，并测试偏离简单的纳瓦罗，弗伦克和怀特（NFW）的形式，密度分布的对数斜率往往$-1$在小半径。具体而言，我们认为作为替代的广义NFW（GNFW）和Einasto参数化。对于GNFW模型，我们发现$β=1.02\pm0.08$的对数内斜率的平均值（减去），具有$σ_β=0.22\pm0.07$的内在散射，而在Einasto情况下，我们将平均形状参数约束为$α=0.29\pm0.04$，具有$σ_α=0.12\pm0.04$的内在散射。因此，我们的结果是一致的，平均与简单的NFW模型，但我们清楚地检测到存在的内在的，集群到集群的平均分散。

英文摘要：

This is the fifth in a series of papers studying the astrophysics and cosmology of massive, dynamically relaxed galaxy clusters. Our sample comprises 40 clusters identified as being dynamically relaxed and hot in Papers I and II of this series. Here we use constraints on cluster mass profiles from X-ray data to test some of the basic predictions of cosmological structure formation in the Cold Dark Matter (CDM) paradigm. We present constraints on the concentration--mass relation for massive clusters, finding a power-law mass dependence with a slope of $κ_m=-0.16\pm0.07$, in agreement with CDM predictions. For this relaxed sample, the relation is consistent with a constant as a function of redshift (power-law slope with $1+z$ of $κ_ζ=-0.17\pm0.26$), with an intrinsic scatter of $σ_{\ln c}=0.16\pm0.03$. We investigate the shape of cluster mass profiles over the radial range probed by the data (typically $\sim50$kpc--1Mpc), and test for departures from the simple Navarro, Frenk & White (NFW) form, for which the logarithmic slope of the density profile tends to $-1$ at small radii. Specifically, we consider as alternatives the generalized NFW (GNFW) and Einasto parametrizations. For the GNFW model, we find an average value of (minus) the logarithmic inner slope of $β=1.02\pm0.08$, with an intrinsic scatter of $σ_β=0.22\pm0.07$, while in the Einasto case we constrain the average shape parameter to be $α=0.29\pm0.04$ with an intrinsic scatter of $σ_α=0.12\pm0.04$. Our results are thus consistent with the simple NFW model on average, but we clearly detect the presence of intrinsic, cluster-to-cluster scatter about the average.

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