论文标题
SPT-CL J2032-5627：与ASKAP观察到的新的南部双重物品集群
SPT-CL J2032-5627: a new Southern double relic cluster observed with ASKAP
论文作者
论文摘要
我们提供了银河系SPT-CL J2032-5627的无线电和X射线分析。对943 MHz的澳大利亚平方公里阵列探路者（ASKAP）的公共数据的调查显示，群集两侧的两个先前未被发现的无线电遗物。对于这两个遗物来源，我们使用5.5 GHz的澳大利亚档案望远镜紧凑型阵列（ATCA）与新的Askap数据一起确定两者都具有陡峭的集成无线电光谱（$α_\ mathrm {serm {se} = -1.52 \ pm 0.10 $ 0.10 $和$α_\ mathrm {遗物来源分别）。但是，在XMM-Newton的观测中看不到冲击，但是，东南遗物在X射线发射群内培养基中是冷锋。我们建议缺乏可检测到的冲击可能是由于工具性的限制，将情况与Abell 3667中的东南遗物进行了比较。我们将这些物品与双重遗物来源的种群进行了比较，并发现它们位于当前功率质量以下（$ p $ -M $ $ M $）。我们介绍了ASKAP和ATCA的低表面亮度敏感性的分析，两者的出色灵敏度允许找到迄今未被发现的弥散源的能力，这表明这些低功率无线电文物将在即将进行的大型大区域无线电调查（例如宇宙进化图（EMU）等大型广播电台调查中变得更加普遍。
We present a radio and X-ray analysis of the galaxy cluster SPT-CL J2032-5627. Investigation of public data from the Australian Square Kilometre Array Pathfinder (ASKAP) at 943 MHz shows two previously undetected radio relics at either side of the cluster. For both relic sources we utilise archival Australia Telescope Compact Array (ATCA) data at 5.5 GHz in conjunction with the new ASKAP data to determine that both have steep integrated radio spectra ($α_\mathrm{SE} = -1.52 \pm 0.10$ and $α_\mathrm{NW,full} = -1.18 \pm 0.10$ for the southeast and northwest relic sources, respectively). No shock is seen in XMM-Newton observations, however, the southeast relic is preceded by a cold front in the X-ray emitting intra-cluster medium. We suggest the lack of a detectable shock may be due to instrumental limitations, comparing the situation to the southeast relic in Abell 3667. We compare the relics to the population of double relic sources and find they are located below the current power-mass ($P$-$M$) scaling relation. We present an analysis of the low-surface brightness sensitivity of ASKAP and the ATCA, the excellent sensitivity of both allow the ability to find heretofore undetected diffuse sources, suggesting these low-power radio relics will become more prevalent in upcoming large-area radio surveys such as the Evolutionary Map of the Universe (EMU).
