Tracing low-mass galaxy clusters using radio relics: the discovery of Abell 3527-bis

Tracing low-mass galaxy clusters using radio relics: the discovery of Abell 3527-bis
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使用射电遗迹追踪低质量星系团:Abell 3527-bis 的发现

DOI:
10.1051/0004-6361/201628945
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发表时间:
2017
影响因子:
6.5
通讯作者:
Brüggen
Brüggen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
de Gasperin;Intema;Salvato;van Weeren;Bonafede;Greiner;Cassano;Brüggen

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星系团经过合并,可以产生被称为无线电遗迹的扩展射电源。射电遗迹是在星系团内介质(ICM)中传播的合并激波的结果。本文分析了一个候选星系团的射电、光学和x射线数据,这些数据是从NRAO VLA巡天(NVSS)探测到的候选射电遗迹的射电发射中选择出来的。我们的目的是澄清这个源的性质,并证明在某些条件下,无线电遗迹的无线电发射可以用来追踪相对低质量的星系团。方法利用巨米波射电望远镜(GMRT)对候选星系团进行3个不同频率的观测。这些数据集与来自ROSAT的x射线档案数据以及来自伽马射线暴光学/近红外探测器(GROND)望远镜的四个不同光学波段的档案数据一起进行了分析。结果:我们确认在一个以前未知的星系团的外围存在一个1 Mpc长的无线电遗迹。我们通过专门的光学观测和档案x射线数据确认了星系团的存在。由于它靠近一个已知的阿贝尔星团,并且红移相似,我们将其命名为阿贝尔3527-bis。该星系团是已知拥有无线电遗迹的质量最小的星系团之一。我们表明,无线电遗迹可以有效地用于追踪相对低质量星系团的一个子集,这些星系团可能在x射线或Sunyaev-Zel 'dovich (SZ)调查中未被发现。这项技术可能用于未来的深层低频调查,如低频阵列(LOFAR),升级的GMRT (uGMRT)以及最终的平方公里阵列(SKA)进行的调查。
ContextGalaxy clusters undergo mergers that can generate extended radio sources called radio relics. Radio relics are the consequence of merger-induced shocks that propagate in the intra cluster medium (ICM).AimsIn this paper we analyse the radio, optical and X-ray data from a candidate galaxy cluster that has been selected from the radio emission coming from a candidate radio relic detected in NRAO VLA Sky Survey (NVSS). Our aim is to clarify the nature of this source and prove that under certain conditions radio emission from radio relics can be used to trace relatively low-mass galaxy clusters.MethodsWe observed the candidate galaxy cluster with the Giant Meterwave Radio Telescope (GMRT) at three different frequencies. These datasets have been analysed together with archival data from ROSAT in the X-ray and with archival data from the Gamma-Ray Burst Optical/Near-Infrared Detector (GROND) telescope in four different optical bands.ResultsWe confirm the presence of a 1 Mpc long radio relic located in the outskirts of a previously unknown galaxy cluster. We confirm the presence of the galaxy cluster through dedicated optical observations and using archival X-ray data. Due to its proximity and similar redshift to a known Abell cluster, we named it Abell 3527-bis. The galaxy cluster is amongst the least massive clusters known to host a radio relic.ConclusionsWe showed that radio relics can be effectively used to trace a subset of relatively low-mass galaxy clusters that might have gone undetected in X-ray or Sunyaev-Zel’dovich (SZ) surveys. This technique might be used in future deep, low-frequency surveys such as those carried on by the Low Frequency Array (LOFAR), the Upgraded GMRT (uGMRT) and, ultimately, the Square Kilometre Array (SKA).
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