The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates

The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates
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第一个超大质量黑洞的光芒:II。

DOI:
10.1017/pasa.2022.42
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发表时间:
2022
影响因子:
6.3
通讯作者:
Broderick J
Broderick J
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Broderick J

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While unobscured and radio-quiet active galactic nuclei are regularly being found at redshifts , their obscured and radio-loud counterparts remain elusive. We build upon our successful pilot study, presenting a new sample of low-frequency-selected candidate high-redshift radio galaxies (HzRGs) over a sky area 20 times larger. We have refined our selection technique, in which we select sources with curved radio spectra between 72–231 MHz from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. In combination with the requirements that our GLEAM-selected HzRG candidates have compact radio morphologies and be undetected in near-infrared -band imaging from the Visible and Infrared Survey Telescope for Astronomy Kilo-degree Infrared Galaxy (VIKING) survey, we find 51 new candidate HzRGs over a sky area of approximately . Our sample also includes two sources from the pilot study: the second-most distant radio galaxy currently known, at , with another source potentially at . We present our refined selection technique and analyse the properties of the sample. We model the broadband radio spectra between 74 MHz and 9 GHz by supplementing the GLEAM data with both publicly available data and new observations from the Australia Telescope Compact Array at 5.5 and 9 GHz. In addition, deep -band imaging from the High-Acuity Widefield K-band Imager (HAWK-I) on the Very Large Telescope and from the Southern Herschel Astrophysical Terahertz Large Area Survey Regions -band Survey (SHARKS) is presented for five sources. We discuss the prospects of finding very distant radio galaxies in our sample, potentially within the epoch of reionisation at .
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