Revealing dual radio sources in a sub-kpc-scale binary active galactic nucleus candidate
Revealing dual radio sources in a sub-kpc-scale binary active galactic nucleus candidate
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揭示亚 kpc 规模的双星活跃星系核候选物中的双射电源
DOI：
10.1093/mnrasl/slac018
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Brooks J
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文献类型：
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作者：
Brooks J
我们展示了来自 Karl G. Jansky 甚大阵列 (VLA) 和多元件无线电连接干涉仪网络 (e-MERLIN) 的亚 kpc 尺度双星活动星系核 (AGN) 候选者的新成像。在约 35 小时的 e-MERLIN 6 厘米成像中，发现了两个未解析的射电源，它们的光度相似，约为 1022 瓦赫兹−1。这些无线电源的角间隔为 0.19 ± 0.06 弧秒，位置角 (PA) 为 22° ± 10°，对应于源历元的预计间隔为 0.95 ± 0.29 kpc。我们的结果表明，在合并后期 atz= 0.35 存在由两个星系托管的 kpc 规模的活跃黑洞对。这项工作遵循 Woo 等人提出的两个光源，它们具有相似的间隔和 PA，速度间隔为 200 km s−1。我们的目标增加了目前有限的近距离双星活动星系核样本，这将有助于理解合并频率和随机引力波背景。
We present new imaging of a sub-kpc-scale binary active galactic nucleus (AGN) candidate from the Karl G. Jansky Very Large Array (VLA) and the Multi-Element Radio Linked Interferometer Network (e-MERLIN). Two unresolved radio sources of similar luminosity around 1022WHz−1are identified in ∼35 h of e-MERLIN 6 cm imaging. These radio sources have an angular separation of 0.19 ± 0.06 arcsec and position angle (PA) of 22° ± 10°, corresponding to a projected separation of 0.95 ± 0.29 kpc at the epoch of the source. Our results suggest the presence of a kpc-scale active black hole pair hosted by two galaxies in the late stage of a merger atz= 0.35. This work follows Woo et al., which presented two optical sources with a similar separation and PA, and a velocity separation of 200 km s−1. Our target adds to the currently limited sample of close-separation binary AGNs, which will aid in understanding the frequency of mergers and the stochastic gravitational wave background.