标题： 来自CLASH样本的 massive 星系团的非热辐射与动力学状态 显示英文标题

标题： Non-thermal emission and dynamical state of massive galaxy clusters from CLASH sample

摘要： 大质量星系团是宇宙中正在经历合并事件的最大尺度结构。根据它们在X射线波段的形态特性，它们被分类为未松弛态和松弛态星系团，并且经常（其中一部分）在其星系际介质（ICM）中宿主不同类型的非热无线电辐射成分，即星系团晕、小尺度晕、遗迹和凤凰遗迹。无线电晕在低频无线电波段表现出陡峭（阿尔法= -1.2）和超陡峭（阿尔法< -1.5）的谱特性，这为星系团的合并状态（前期或后期）提供了重要的见解。超陡谱无线电晕发射是非常稀有的，并预计在未来通过LOFAR和SKA望远镜将主导发现。此外，物质分布（形态信息）、来自ICM的热X射线发射气体与总质量（暗物质+重子物质）以及明亮的星系团星系（BCG）之间的对齐通常用于研究星系团的动力学状态。我们在此展示了CLASH巡天中14个大质量星系团的多波段研究，并展示了它们在X射线中的合并状态与无线电波段（1.4 GHz - 150 MHz）光谱特性的相关性。利用光学数据，我们也讨论了气体质量对齐情况，以了解大质量星系团中暗物质和重子物质之间的相互作用。 显示英文摘要

摘要： Massive galaxy clusters are the most violent large scale structures undergoing merger events in the Universe. Based upon their morphological properties in X-rays, they are classified as un-relaxed and relaxed clusters and often host (a fraction of them) different types of non-thermal radio emitting components, viz., haloes, mini-haloes, relics and phoenix within their Intra Cluster Medium (ICM). The radio haloes show steep (alpha = -1.2) and ultra steep (alpha < -1.5) spectral properties at low radio frequencies, giving important insights on the merger (pre or post) state of the cluster. Ultra steep spectrum radio halo emissions are rare and expected to be the dominating population to be discovered via LOFAR and SKA in the future. Further, the distribution of matter (morphological information), alignment of hot X-ray emitting gas from the ICM with the total mass (dark + baryonic matter) and the bright cluster galaxy (BCG) is generally used to study the dynamical state of the cluster. We present here a multi wavelength study on 14 massive clusters from the CLASH survey and show the correlation between the state of their merger in X-ray and spectral properties (1.4 GHz - 150 MHz) at radio wavelengths. Using the optical data we also discuss about the gas-mass alignment, in order to understand the interplay between dark and baryonic matter in massive galaxy clusters.