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arXiv 1603.03047astro-ph.GAastro-ph.CO
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星系团核1中的光发射线星云:样品的形态学、运动学和光谱特性

Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample

S. L. Hamer, A. C. Edge, A. M. Swinbank, R. J. Wilman, F. Combes, P. Salomé, A. C. Fabian, C. S. Crawford, H. R. Russell, J. Hlavacek-Larrondo, B. McNamara, M. N. Bremer

摘要:

利用VLT上的可见多目标摄谱仪(VIMOS)对73个星系团和星系群进行了积分场单位巡天。我们利用这些数据,以确定的H $α$气体动力学的kpc尺度上研究的反馈过程中发生的密集的集群核心。我们确定的电离气体的运动学状态,并表明,大多数系统($\sim$ 2/3)有相对有序的速度场的千秒差距尺度是类似的旋转光盘的运动学和从恒星运动学的Brilliant星团星系解耦。H $α$通量的大部分($>$ 50%)通常与这些有序的运动学相关,并且大多数系统显示出相对简单的形态,表明它们没有受到最近合并或相互作用的干扰。大约20%的样品(13/73)有扰动的形态,这通常可以归因于活动星系核活动破坏气体。只有一个系统显示出与另一个集群成员相互作用的证据。对气体的光谱分析表明,星团核心内气体的电离主要是由非恒星过程控制的,可能源于星团内介质本身。

英文摘要:

We present an Integral Field Unit survey of 73 galaxy clusters and groups with the VIsible Multi Object Spectrograph (VIMOS) on VLT. We exploit the data to determine the H$α$ gas dynamics on kpc-scales to study the feedback processes occurring within the dense cluster cores. We determine the kinematic state of the ionised gas and show that the majority of systems ($\sim$ 2/3) have relatively ordered velocity fields on kpc scales that are similar to the kinematics of rotating discs and are decoupled from the stellar kinematics of the Brightest Cluster Galaxy. The majority of the H$α$ flux ($>$ 50%) is typically associated with these ordered kinematics and most systems show relatively simple morphologies suggesting they have not been disturbed by a recent merger or interaction. Approximately 20% of the sample (13/73) have disturbed morphologies which can typically be attributed to AGN activity disrupting the gas. Only one system shows any evidence of an interaction with another cluster member. A spectral analysis of the gas suggests that the ionisation of the gas within cluster cores is dominated by non stellar processes, possibly originating from the intracluster medium itself.

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