香肠星团漫射射电源的uGMRT亚GHz视图

Ramij Raja, Oleg M. Smirnov, Tiziana Venturi, Majidul Rahaman, H. -Y. Karen Yang
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摘要

CIZA J2242.8+5301,即香肠星团,在一系列频率范围内都得到了很好的研究。自首次发现以来,已经发现了许多有趣的特征和独特的特性。在这项工作中,我们利用 uGMRT 波段-3 和波段-4 数据报告了一些新的形态特征。在北遗迹中,我们观测到遗迹宽度范围内光谱指数剖面由东向西的变化,这可能表明该方向的下游冷却速率有所下降。我们再次确认了北部存在一个约 930 kpc 的额外遗迹。我们把下游区域的丝状源归类为窄角尾(NAT)射电星系。东侧遗迹中的亮弧在光谱指数剖面上显示出亚结构,这可能表明存在细丝。我们进一步报告说,东侧遗迹中存在一个类似于 "牙刷 "遗迹的双股结构。我们把南部遗迹中明亮的 "L "形结构归类为NAT射电星系,并追踪了实际的~ 1.1 Mpc遗迹部分。我们再次证实了南部遗迹的存在,测量到的遗迹长度约为 1.8 Mpc。此外,我们还认为南部遗迹是由单个遗迹组成的,而不是一个巨大的丝状遗迹。最后,根据北部和南部遗迹的形态对称性,我们提出了与合并事件相关的冲击结构,试图解释它们的形成过程。
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uGMRT sub-GHz view of the Sausage cluster diffuse radio sources
CIZA J2242.8+5301, or the Sausage cluster, is well studied over a range of frequencies. Since its first discovery, a lot of interesting features and unique characteristics have been uncovered. In this work, we report some more new morphological features using the uGMRT band-3 and band-4 data. In the north relic, we observe variation in spectral index profiles across the relic width from the east to west, which may indicate a decrease in downstream cooling rate in that direction. We re-confirm the presence of an additional ~ 930 kpc relic in the north. We classify the filamentary source in the downstream region to be a narrow angle tail (NAT) radio galaxy. The bright arc in the east relic shows sub-structure in the spectral index profile, which may indicate the presence of finer filaments. We further report the presence of a double-strand structure in the east relic similar to the 'Toothbrush' relic. We categorize the bright 'L' shaped structure in the southern relic to be a NAT radio galaxy, as well as trace the actual ~ 1.1 Mpc relic component. We re-confirm the existence of the faint southern extent, measuring the relic length to be ~ 1.8 Mpc. Furthermore, we suggest the southern relic to be a union of individual component relics rather than a single giant filamentary relic. Lastly, based on the morphological symmetry between northern and southern relics, we suggest a schematic shock structure associated with the merger event in an attempt to explain their formation scenario.
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