论文标题
追逐从宏到Galaxy群集ZWCL 235中的宏到中量尺度的ICM冷却和AGN反馈
Chasing ICM cooling and AGN feedback from the macro to the meso scales in the galaxy cluster ZwCl 235
论文作者
论文摘要
我们旨在研究ZWCL 235中的AGN/ICM相互作用，这是一个带有高X射线通量的星系群集，一个延伸的中央射电星系，以及其中心多相气体的证据。我们使用Chandra望远镜，Vlass Survey，Lots Survey和VLBA望远镜的档案数据，对ZWCL 235进行了完整的研究，解剖了ICM的动力学，中央气体的热力学状态以及BCG的性质。通过径向曲线和2D光谱图，我们测量了ICM的温度，熵和冷却时间，并将中央射电星系的形态与周围介质进行比较。我们发现证据表明ZWCL 235是一个宽道凉爽的核心簇，其中中央星系的活性挖掘出了一对腔，并可能将富集的气体升至约30 kpc的高度。在簇芯中，最低的熵ICM优先在20 kpc长的长丝中与AGN的南部无线电叶进行切线。我们认为，观察到的凉爽（〜1.3 keV）可能是通过摇摆和刺激的ICM冷却来产生的，ICM冷却可能会加剧中央超级质量黑洞。此外，我们确定BCG的X射线发射起源于〜1.4 keV等离子核，该核在半径上延伸了5 kpc，并且冷却时间很短（约240 Myr），并且可以代表BCG的热力圆锥。总体而言，我们建议冷材料的几种来源（大型ICM，低熵细丝和〜1.4 keV核）目前正在喂食中央AGN，并且ICM冷却周期的预期是从宏尺度（5-100 kpc之间）满足AGN反馈的MESO量表（<5 kpc）的。
We aim to investigate the AGN/ICM interplay in ZwCl 235, a galaxy cluster with high X-ray flux, an extended central radio galaxy, and evidence of multi-phase gas at its center. Using archival data from the Chandra telescope, the VLASS survey, the LOTSS survey and the VLBA telescope, we perform a complete study of ZwCl 235, dissecting the dynamics of the ICM, the thermodynamic state of the central gas, and the properties of the BCG. By means of radial profiles and 2D spectral maps, we measure the temperature, entropy and cooling time of the ICM, and we compare the morphology of the central radio galaxy with the surrounding medium. We find evidence that ZwCl 235 is a sloshing cool core cluster in which the activity of the central galaxy has excavated a pair of cavities and possibly uplifted enriched gas to an altitude of ~30 kpc. In the cluster core, the lowest entropy ICM is preferentially found in a 20 kpc-long filament tangential to the southern radio lobe of the AGN. We argue that the observed cool (~1.3 keV) filament is likely produced by a combination of sloshing and stimulated ICM cooling, that may be fueling the central supermassive black hole. Additionally, we determine that the X-ray emission of the BCG originates from a ~1.4 keV plasma kernel which extends for 5 kpc in radius and has a short cooling time (~240 Myr), and could represent the thermal corona of the BCG. Overall, we propose that several sources (the large scale ICM, the low entropy filament and the ~1.4 keV kernel) of cold material are currently feeding the central AGN, and that the ICM cooling cycle expectations are met from the macro scales (between 5 - 100 kpc) to the meso scales (<5 kpc) of AGN feedback.
