来自澳大利亚平方公里阵列探路者（ASKAP）的早期科学观测揭示了与南极望远镜通过其Sunyaev Zel'dovich信号探测到的两个星团有关的漫射无线电发射的清晰信号。SPT CLJ 0553 -3342（MACSJ0553.4-3342）和SPT CLJ 0638 -5358（Abell S 0592）都是经历了重大合并的高质量透镜星系团。为了改进这些ASKAP早期科学观测的数据产品，并创建星系团的科学保真度图像，我们使用最先进的软件{ \sc DMMS}和{ \sc DDFacet}进行了方向相关（DD）校准和成像。我们发现，在ASKAP图像的伪影大大减少后，方向校准。在这里，我们提出了我们的DD校准ASKAP无线电图像的两个集群显示明确的巨型无线电晕与最大的线性尺度为$\sim1$ ~Mpc。MACSJ0553.4-3342中的晕轮先前在323 MHz的GMRT观测中被检测到，但在我们的ASKAP图像中看起来更扩展。虽然有一个冲击检测到在这个集群的热X射线发射，我们发现，在冲击区域的粒子数密度太低，允许产生的射电冲击。Abell S 0592中的射电晕是一个新发现，其西南边界与X射线中检测到的冲击相吻合。我们讨论了这些晕的起源考虑强子和湍流再加速模型以及来源的\textit{seed}电子。这项工作对ASKAP的宇宙演化图（EMU）调查在探测星团内中等射电源方面的潜力给出了积极的指示，并展示了利用第三代校准技术后数据产品的改进。
英文摘要：
Early science observations from the Australian Square Kilometre Array Pathfinder (ASKAP) have revealed clear signals of diffuse radio emission associated with two clusters detected by the South Pole Telescope via their Sunyaev Zel'dovich signal. SPT CLJ0553-3342 (MACSJ0553.4-3342) and SPT CLJ0638-5358 (Abell S0592) are both high-mass lensing clusters that have undergone major mergers. To improve the data products of these ASKAP early science observations and create science-fidelity images of the galaxy clusters, we performed direction-dependent (DD) calibration and imaging using state-of-the-art software {\sc killMS} and {\sc DDFacet}. We find that artefacts in the ASKAP images are greatly reduced after directional calibration. Here we present our DD calibrated ASKAP radio images of both clusters showing unambiguous giant radio halos with largest linear scales of $\sim1$~Mpc. The halo in MACSJ0553.4-3342 was previously detected with GMRT observations at 323 MHz, but appears more extended in our ASKAP image. Although there is a shock detected in the thermal X-ray emission of this cluster, we find that the particle number density in the shocked region is too low to allow for the generation of a radio shock. The radio halo in Abell S0592 is a new discovery, and the Southwest border of the halo coincides with a shock detected in X-rays. We discuss the origins of these halos considering both the hadronic and turbulent re-acceleration models as well as sources of \textit{seed} electrons. This work gives a positive indication of the potential of ASKAP's Evolutionary Map of the Universe (EMU) survey in detecting intracluster medium radio sources, and showcases the improvement in data products after utilising third-generation calibration techniques.
SPT-CL J0417-4748: A Deep Chandra Study of a Relaxed Galaxy Cluster Without Central Star Formation
Chulalongkorn University（朱拉隆功大学）；Kavli Institute for Particle Astrophysics and Cosmology, Stanford University（斯坦福大学卡弗里粒子天体物理与宇宙学研究所）；Department of Physics, Stanford University（斯坦福大学物理系）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Department of Physics and Astronomy, Rutgers University（罗格斯大学物理与天文系）
Discovery of a nearby radio relic in the low-mass, merging cluster Abell 4067
University of the Witwatersrand（威特沃特斯兰德大学）；University of Pretoria（比勒陀利亚大学）；SKA Observatory（平方公里阵列射电望远镜天文台）；University of Oxford（牛津大学）；Rhodes University（罗兹大学）；South African Radio Astronomy Observatory（南非射电天文观测站）；Texas A&M University（德克萨斯农工大学）；Chulalongkorn University（朱拉隆功大学）
Euclid: A blue galaxy population and a brightest cluster galaxy in the making in a $z\sim1.74$ MaDCoWS2 galaxy cluster candidate
Academia Sinica Institute of Astronomy and Astrophysics（中央研究院天文及天文物理研究所）；University of Florida（佛罗里达大学）；University of California, Davis（加州大学戴维斯分校）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；Korea Astronomy and Space Science Institute（韩国天体宇宙科学研究所）
