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The GLEAMing of the first supermassive black holes
Publications of the Astronomical Society of Australia ( IF 6.3 ) Pub Date : 2020-07-16 , DOI: 10.1017/pasa.2020.6
Guillaume Drouart , Nick Seymour , Tim J. Galvin , Jose Afonso , Joseph R. Callingham , Carlos De Breuck , Melanie Johnston-Hollitt , Anna D. Kapińska , Matthew D. Lehnert , Joël Vernet

We present the results of a new selection technique to identify powerful ( $L_{\rm 500\,MHz} \gt 10^{27}\,\text{WHz}^{-1}$ ) radio galaxies towards the end of the Epoch of Reionisation. Our method is based on the selection of bright radio sources showing radio spectral curvature at the lowest frequency ( ${\sim}100\,\text{MHz}$ ) combined with the traditional faintness in K-band for high-redshift galaxies. This technique is only possible, thanks to the Galactic and Extra-galactic All-sky Murchison Wide-field Array survey which provides us with 20 flux measurements across the 70– $230\,\text{MHz}$ range. For this pilot project, we focus on the GAMA 09 field to demonstrate our technique. We present the results of our follow-up campaign with the Very Large Telescope, Australian Telescope Compact Array, and the Atacama Large Millimetre Array to locate the host galaxy and to determine its redshift. Of our four candidate high-redshift sources, we find two powerful radio galaxies in the $1<z<3$ range, confirm one at $z=5.55$ , and present a very tentative $z=10.15$ candidate. Their near-infrared and radio properties show that we are preferentially selecting some of the most radio luminous objects, hosted by massive galaxies very similar to powerful radio galaxies at $1<z<5$ . Our new selection and follow-up technique for finding powerful radio galaxies at $z>5.5$ has a high 25–50% success rate.

中文翻译:

第一个超大质量黑洞的闪耀

我们展示了一种新的选择技术的结果,以识别强大的 ( $L_{\rm 500\,MHz} \gt 10^{27}\,\text{WHZ}^{-1}$ ) 再电离时代末期的射电星系。我们的方法基于选择在最低频率处显示射电频谱曲率的明亮射电源( ${\sim}100\,\text{MHz}$ ) 结合传统的模糊ķ高红移星系的波段。这种技术是唯一可行的,这要归功于银河系和银河系外全天空默奇森宽视场阵列调查,它为我们提供了跨越 70-20 次通量测量 $230\,\文本{MHz}$ 范围。对于这个试点项目,我们专注于 GAMA 09 领域来展示我们的技术。我们展示了我们用超大望远镜、澳大利亚望远镜紧凑阵列和阿塔卡马大型毫米阵列进行的后续活动的结果,以定位宿主星系并确定其红移。在我们的四个候选高红移源中,我们发现两个强大的射电星系位于 $1<z<3$ 范围,确认一个在 $z=5.55$ ,并提出一个非常试探性的 $z=10.15$ 候选人。它们的近红外和射电特性表明,我们优先选择一些射电最明亮的天体,这些天体由与强大的射电星系非常相似的大质量星系托管 $1<z<5$ . 我们用于寻找强大射电星系的新选择和后续技术 $z>5.5$ 成功率高达 25-50%。
更新日期:2020-07-16
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