Evolutionary Map of the Universe (EMU): Observations of Filamentary Structures in the Abell S1136 Galaxy Cluster

IF 4.5 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Australia Pub Date : 2024-05-23 DOI:10.1017/pasa.2024.36

P. Macgregor, R. Norris, Andrew N. O'Brien, Mohammad Akhlaghi, Craig Anderson, J. D. Collier, Evan J. Crawford, S. Duchesne, Miroslav D. Filipović, B. Koribalski, F. Pacaud, T. Reiprich, C. Riseley, L. Rudnick, T. Vernstrom, Andrew M. Hopkins, M. Johnston-Hollitt, J. Marvil, Matthew Whiting, S. Tingay

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引用次数: 0

Abstract

We present radio observations of the galaxy cluster Abell S1136 at 888 MHz, using the Australian Square Kilometre Array Pathfinder radio telescope, as part of the Evolutionary Map of the Universe Early Science program. We compare these findings with data from the Murchison Widefield Array, XMM-Newton, theWide-field Infrared Survey Explorer, the Digitised Sky Survey, and the Australia Telescope Compact Array. Our analysis shows the X-ray and radio emission in Abell S1136 are closely aligned and centered on the BCG, while the X-ray temperature profile shows a relaxed cluster with no evidence of a cool core. We find that the diffuse radio emission in the centre of the cluster shows more structure than seen in previous low-resolution observations of this source, which appeared formerly as an amorphous radio blob, similar in appearance to a radio halo; our observations show the diffuse emission in the Abell S1136 galaxy cluster contains three narrow filamentary structures visible at 888 MHz, between ∼80 and 140 kpc in length; however the properties of the diffuse emission do not fully match that of a radio (mini-)halo or (fossil) tailed radio source.

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宇宙进化地图（EMU）：Abell S1136星系团中的丝状结构观测结果

我们介绍了利用澳大利亚平方公里阵列探路者射电望远镜在888 MHz频率下对星系团Abell S1136进行的射电观测，这是宇宙早期科学进化地图计划的一部分。我们将这些发现与来自默奇森宽视场阵列、XMM-牛顿、宽视场红外巡天探测器、数字化巡天和澳大利亚望远镜紧凑阵列的数据进行了比较。我们的分析表明，Abell S1136 中的 X 射线和射电辐射紧密地排列在一起，并以 BCG 为中心，而 X 射线温度曲线则显示出一个宽松的星团，没有迹象表明存在一个冷核。我们发现，星团中心的弥漫射电辐射比以前低分辨率观测到的更有结构性，以前它只是一个无定形的射电球体，类似于射电晕；我们的观测结果表明，Abell S1136星系团中的弥散发射包含三个在888 MHz频率下可见的狭窄的丝状结构，长度在80到140 kpc之间；但是弥散发射的特性并不完全符合射电（小）光环或（化石）尾射电源的特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Publications of the Astronomical Society of Australia 地学天文-天文与天体物理

CiteScore

5.90

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Publications of the Astronomical Society of Australia (PASA) publishes new and significant research in astronomy and astrophysics. PASA covers a wide range of topics within astronomy, including multi-wavelength observations, theoretical modelling, computational astronomy and visualisation. PASA also maintains its heritage of publishing results on southern hemisphere astronomy and on astronomy with Australian facilities. PASA publishes research papers, review papers and special series on topical issues, making use of expert international reviewers and an experienced Editorial Board. As an electronic-only journal, PASA publishes paper by paper, ensuring a rapid publication rate. There are no page charges. PASA''s Editorial Board approve a certain number of papers per year to be published Open Access without a publication fee.