Optical/X-ray/radio view of Abell 1213: A galaxy cluster with anomalous diffuse radio emission
Optical/X-ray/radio view of Abell 1213: A galaxy cluster with anomalous diffuse radio emission
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Abell 1213 的光学/X 射线/射电视图：具有异常漫射射电发射的星系团
DOI：
10.1051/0004-6361/202345842
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发表时间：
2023
影响因子：
6.5
通讯作者：
Boschin W
中科院分区：
文献类型：
--
作者：
Boschin W
ConextAbell 1213是一个低丰度星系，已知它拥有一个在甚大阵列(VLA)数据中探测到的异常射电晕。它是关于射电晕功率和母星团X射线光度之间关系的离群值。目的我们的目的是分析该星系团的光学、X射线和射电波段，以表征其漫射射电发射的环境，并揭示其性质。我们还对XMM-NewtonX射线数据进行了分析，以揭示其热团内介质的性质。最后，我们使用144 MHz的低频阵列(LOFAR)的最新数据和1.4 GHz的VLA数据来研究弥散射电源的频谱行为。事实上，它是由外围地区的几个星系群组成的，特别是在核心，我们在那里发现了沿NE-西南方向定向的子结构的证据，并有迹象表明几乎沿着视线合并。对X射线发射的分析进一步证明，该星系团处于非松弛动力学状态。在射电波段，LOFAR数据显示漫射辐射的大小为∼510kpc。此外，星团中心还存在低表面亮度辐射的迹象。结论漫射射电辐射的环境不是我们所期望的经典晕。射电源的谱折射率图符合遗迹解释，可能是由于N-S或NE-西南方向的合并，与光学分析探测到的子结构一致。星团中心的零散、弥漫的射电辐射可以归因于微弱的中央射电晕的表面亮度峰值。
ContextAbell 1213, a low-richness galaxy system, is known to host an anomalous radio halo detected in data of the Very Large Array (VLA). It is an outlier with regard to the relation between the radio halo power and the X-ray luminosity of the parent clusters.AimsOur aim is to analyze the cluster in the optical, X-ray, and radio bands to characterize the environment of its diffuse radio emission and to shed new light on its nature.MethodsWe used optical data from the Sloan Digital Sky Survey to study the internal dynamics of the cluster. We also analyzed archivalXMM-NewtonX-ray data to unveil the properties of its hot intracluster medium. Finally, we used recent data from the LOw Frequency ARray (LOFAR) at 144 MHz, together with VLA data at 1.4 GHz, to study the spectral behavior of the diffuse radio source.ResultsBoth our optical and X-ray analysis reveal that this low-mass cluster exhibits disturbed dynamics. In fact, it is composed of several galaxy groups in the peripheral regions and, in particular, in the core, where we find evidence of substructures oriented in the NE–SW direction, with hints of a merger nearly along the line of sight. The analysis of the X-ray emission adds further evidence that the cluster is in an unrelaxed dynamical state. At radio wavelengths, the LOFAR data show that the diffuse emission is ∼510 kpc in size. Moreover, there are hints of low-surface-brightness emission permeating the cluster center.ConclusionsThe environment of the diffuse radio emission is not what we would expect for a classical halo. The spectral index map of the radio source is compatible with a relic interpretation, possibly due to a merger in the N–S or NE–SW directions, in agreement with the substructures detected through the optical analysis. The fragmented, diffuse radio emissions at the cluster center could be attributed to the surface brightness peaks of a faint central radio halo.
用于密度估计的内核数据压缩
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
Atsuyuki;Kogure;Masahiko;Sagae
通讯作者：
Sagae