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 ( $\ensuremath{{\alpha_\mathrm{SE} = -1.52 \pm 0.10}}$ and $\ensuremath{{\alpha_\mathrm{NW,full} = -1.18 \pm 0.10}}$ 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 that they are located below the current power–mass 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.

中文翻译：

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SPT-CL J2032-5627：用 ASKAP 观察到的一个新的南方双遗迹群

我们对星系团 SPT-CL J2032-5627 进行无线电和 X 射线分析。对来自澳大利亚平方公里阵列探路者 (ASKAP) 在 943 MHz 的公共数据的调查显示，在星团两侧有两个以前未被发现的无线电遗迹。对于这两个遗迹源，我们利用 5.5 GHz 的澳大利亚望远镜紧凑阵列 (ATCA) 档案数据以及新的 ASKAP 数据来确定两者都具有陡峭的综合无线电频谱 ( $\ensuremath{{\alpha_\mathrm{SE} = -1.52 \pm 0.10}}$ 和 $\ensuremath{{\alpha_\mathrm{NW,full} = -1.18 \pm 0.10}}$ 分别为东南和西北遗迹源）。XMM中没有看到震惊-牛顿观察；然而，东南部遗迹之前是发射 X 射线的星团内介质中的冷锋。我们认为缺乏可检测到的冲击可能是由于仪器限制，将这种情况与 Abell 3667 的东南部遗迹进行比较。我们将这些遗迹与双遗迹源的人口进行比较，发现它们位于当前的功率质量标度之下关系。我们对 ASKAP 和 ATCA 的低表面亮度灵敏度进行了分析，两者都具有出色的灵敏度，能够发现迄今为止未被检测到的漫射源，这表明这些低功率无线电遗迹将在即将到来的大面积无线电调查中变得更加普遍比如宇宙进化图。