In this paper, we present results from a radio–optical study of the galaxy populations of the galaxy clusters Abell 1300 and MACS J1931.8−2634, a merger and a relaxed system respectively both located at z ∼ 0.3, aimed at finding evidence of merger-induced radio emission. Radio observations are taken at 1.28 GHz with the MeerKAT interferometer during its early-stage commissioning phase, and combined with archive optical data. We generated catalogues containing 107 and 162 radio sources in the A 1300 and MACS J1931.8−2634 cluster fields, respectively, above a 0.2 mJy threshold and within a 30 arcmin radius from the cluster centre (corresponding to 8.1 and 8.8 Mpc, respectively). By cross-correlating the radio and optical catalogues, and including spectroscopic information, nine and six sources were found to be cluster members and used to construct the radio luminosity functions, respectively, for both clusters. The comparison of the radio source catalogues between the two cluster fields leads to a marginal difference, with a 2σ statistical significance. We derived the radio luminosity function at 1.28 GHz in both clusters, in the power range of $22.81 \lt \rm {log~\mathit{ P}_{1.28~GHz}~(W\,Hz^{-1})} \lt 25.95$, and obtained that in A 1300 the radio luminosity function averaged over the full radio power interval is only 3.3 ± 1.9 times higher than the MACS J1931.8−2634 one, suggesting no statistical difference in their probability to host nuclear radio emission. We conclude that, at least for the two clusters studied here, the role of cluster mergers in affecting the statistical properties of the radio galaxy population is negligible.

中文翻译：

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MeerKAT 对星系团的看法：Abell 1300 和 MACS J1931.8-2634 的射电光学研究

在本文中，我们展示了对星系团 Abell 1300 和 MACS J1931.8-2634 的星系群的无线电光学研究结果，这两个星系团分别位于 z ∼ 0.3，旨在寻找证据合并引起的无线电发射。在早期调试阶段使用 MeerKAT 干涉仪在 1.28 GHz 进行无线电观测，并结合存档光学数据。我们在 A 1300 和 MACS J1931.8−2634 集群场中生成了包含 107 个和 162 个无线电源的目录，分别高于 0.2 mJy 阈值和距集群中心 30 弧分半径范围内（分别对应于 8.1 和 8.8 Mpc） . 通过交叉关联无线电和光学目录，并包括光谱信息，发现九个和六个源是星团成员，并分别用于构建两个星团的射电光度函数。两个簇场之间的射电源目录的比较导致了边际差异，具有 2σ 的统计显着性。我们在两个集群中导出了 1.28 GHz 的射电光度函数，功率范围为 $22.81 \lt \rm {log~\mathit{ P}_{1.28~GHz}~(W\,Hz^{-1})} \lt 25.95$，并得出在 A 1300 中，在整个无线电功率间隔内平均的射电光度函数仅比 MACS J1931.8-2634 高 3.3 ± 1.9 倍，这表明它们托管核无线电的概率没有统计学差异排放。我们得出结论，至少对于这里研究的两个集群，