Discovery of galaxy clusters and a head-tail radio galaxy in the direction of globular cluster NGC 6752
Discovery of galaxy clusters and a head-tail radio galaxy in the direction of globular cluster NGC 6752
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发现星系团和球状星团NGC 6752方向的头尾射电星系
DOI：
10.1093/mnras/stab2455
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发表时间：
2021
影响因子：
4.8
通讯作者：
Li Zhiyuan
中科院分区：
文献类型：
--
作者：
Cheng Zhongqun;Sun Xiaohui;Wang Wei;Li Zhiyuan
本文报道了在天文观测资料的基础上，在球状星团NGC 6752的方向上偶然发现的两个星系团CX 191100 -595621和CX 191012 -595619的发现。deepChandraX射线数据使我们能够测量这两个系统的特性。CX 191100 -595621和CX 191012 -595619的红移分别为z = 0.239 ± 0.013和z = 0.375 ± 0.016，温度分别为keV和keV，铁丰度分别为和，静止框架全带光度分别为和（0.5-7 keV）。发现CX 191100 -595621的温度分布随半径的减小而减小，表明该星团中存在冷核。流体静力平衡估计表明，集群是中等加权，与，分别。我们在星团中寻找X射线点源的光学和射电对应物。发现了三个活动星系核，其中一个与窄角尾射电星系有关，另一个与最亮的中央星系CXJ 191100 -595621有关。
We report on the discovery of CXOU J191100–595621 and CXOU J191012–595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archivalChandraobservations with a total exposure time of ∼344 ks. The deepChandraX-ray data enabled us to measure the properties of both systems. We found a redshift ofz= 0.239 ± 0.013 andz= 0.375 ± 0.016, a temperature ofkeV andkeV, an iron abundance ofandand a rest-frame full band (0.5–7 keV) luminosity ofandfor CXOU J191100–595621 and CXOU J191012–595619, respectively. The temperature profile of CXOU J191100–595621 is found to decrease with decreasing radius, indicating a cool core in this cluster. The hydrostatic equilibrium estimation suggests that the clusters are moderately weighted, withand, respectively. We search for optical and radio counterparts of X-ray point sources in the clusters. Three active galactic nuclei are found, among which one is identified with a narrow-angle-tail radio galaxy, and one is found to be associated with the brightest central galaxy of CXOU J191100–595621.