球状星团NGC 6752方向星系团和头尾射电星系的发现
Discovery of Galaxy Clusters and a Head-Tail Radio Galaxy in the Direction of Globular Cluster NGC 6752
摘要：
本文报道了在总曝光时间为1 kS的{ \it Chandra}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。深{ \it钱德拉} X射线数据使我们能够测量两个系统的性质，这导致$z=0.239\pm0.013$和$z=0.375\pm0.016$的红移，$kT=3.32^{+0.57}_{-0.46}$ keV和$kT=3.71^{+1.18}_{-0.86}$ keV的温度，$Z_{\rm Fe}=0.64^{+0.34}_{-0.29}Z_{\rm Fe\odot}$和$Z_{\rm Fe}=1.29^{+0.97}_{-0.65}Z_{\rm Fe\odot}$的铁丰度，以及CXFLOW J191100-595621和CXFLOW J191012-595619的分别为$L_{\rm X}=9.2^{+1.2}_{-1.1}\times 10^{43} {\rm \, erg\, s^{-1}}$和$L_{\rm X}=9.9^{+2.7}_{-2.2}\times 10^{43} {\rm \, erg\, s^{-1}}$的静止帧全带（0.5-7 keV）光度。发现CXCRJ 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，分别与$M_{500}=(1.3\pm0.4)\times 10^{14}\, M_{\odot}$和$M_{500}=(2.0\pm1.5)\times 10^{14}\, M_{\odot}$。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，另一个与最亮的中心星系（BCG）CX 191100 -595621有关。
英文摘要：
We report 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 archival {\it Chandra} observations with a total exposure time of $\sim 344$ ks. The deep {\it Chandra} X-ray data enabled us to measure properties of both systems, which result in a redshift of $z=0.239\pm0.013$ and $z=0.375\pm0.016$, a temperature of $kT=3.32^{+0.57}_{-0.46}$ keV and $kT=3.71^{+1.18}_{-0.86}$ keV, an iron abundance of $Z_{\rm Fe}=0.64^{+0.34}_{-0.29}Z_{\rm Fe\odot}$ and $Z_{\rm Fe}=1.29^{+0.97}_{-0.65}Z_{\rm Fe\odot}$, and a rest-frame full band (0.5-7 keV) luminosity of $L_{\rm X}=9.2^{+1.2}_{-1.1}\times 10^{43} {\rm \, erg\, s^{-1}}$ and $L_{\rm X}=9.9^{+2.7}_{-2.2}\times 10^{43} {\rm \, erg\, s^{-1}}$ for CXOU J191100-595621 and CXOU J191012-595619, respectively. The temperature profile of CXOU J191100-595621 is found to decreases with decreasing radius, indicating a cool core in this cluster. The hydrostatic equilibrium estimation suggests the clusters are moderately weighted, with $M_{500}=(1.3\pm0.4)\times 10^{14}\, M_{\odot}$ and $M_{500}=(2.0\pm1.5)\times 10^{14}\, M_{\odot}$, 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 associated with the brightest central galaxy (BCG) of CXOU J191100-595621.
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