论文标题
新指标以探测星系簇的动态状态
New metrics to probe the dynamical state of galaxy clusters
论文作者
论文摘要
我们提出了新的诊断指标，以探测星系簇的动态状态。这些新颖的指标依赖于物质和气体分布的功率谱的计算及其源自群集观测的交叉相关。该分析允许我们交叉汇总物质分布的波动，这些波动是从源自哈勃空间望远镜（HST）数据得出的高分辨率镜头质量图，其中这些图是从发射的X射线表面亮度分布的X射线表面亮度分布（ICM）来自Chandra X射线X射线X射线X-ray observatory（CXO）。这些方法学工具使我们能够用前所未有的分辨率量化气体跟踪质量并询问气体在水力静态平衡中具有与潜在的重力潜力的假设。我们表征了与平衡的偏离，这是具有新的气体相干参数的比例函数。这些指标的功效通过将它们应用于对两个代表性群集的分析来证明这些指标：来自HST Frontier Fields（HSTFF）样本的大规模合并集群Abell 2744，以及动态放松的群集Abell 383，来自群集透镜和超级透镜和超级新闻（Clubble（Clubble）样本（clubble（Clubble））。使用镜头质量图与档案恰好数据结合使用，并模拟了欧米茄500套件可提供的群集类似物，我们量化了质量和X射线表面亮度的波动，并表明可以从我们的气体质量凝聚力分析中获得对簇的动力学状态的新见解。
We present new diagnostic metrics to probe the dynamical state of galaxy clusters. These novel metrics rely on the computation of the power spectra of the matter and gas distributions and their cross-correlation derived from cluster observations. This analysis permits us to cross-correlate the fluctuations in the matter distribution, inferred from high-resolution lensing mass maps derived from Hubble Space Telescope (HST) data, with those derived from the emitted X-ray surface brightness distribution of the hot Intra-Cluster medium (ICM) from the Chandra X-ray Observatory (CXO). These methodological tools allow us to quantify with unprecedented resolution the coherence with which the gas traces the mass and interrogate the assumption that the gas is in hydro-static equilibrium with the underlying gravitational potential. We characterize departures from equilibrium as a function of scale with a new gas-mass coherence parameter. The efficacy of these metrics is demonstrated by applying them to the analysis of two representative clusters known to be in different dynamical states: the massive merging cluster Abell 2744, from the HST Frontier Fields (HSTFF) sample, and the dynamically relaxed cluster Abell 383, from the Cluster Lensing And Supernova Survey with Hubble (CLASH) sample. Using lensing mass maps in combination with archival Chandra data, and simulated cluster analogs available from the OMEGA500 suite, we quantify the fluctuations in the mass and X-ray surface brightness and show that new insights into the dynamical state of the clusters can be obtained from our gas-mass coherence analysis.
