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Table 1.
Number of AGNs with secure spectroscopic redshifts (third column) per survey for the eight surveys used in this study.
| Survey | Reference | Nspecz | NH < 1022 | ≥1022 | ≥1023.5 |
|---|---|---|---|---|---|
| AEGIS-XD | Nandra et al. (2015), Brightman et al. (2014) | 252 | 154 | 98 | 33 |
| CDWFS | Masini et al. (2020) | 1992 | 1002 | 990 | 24 |
| CCL | Civano et al. (2016), Marchesi et al. (2016), Lanzuisi et al. (2018) | 753 | 463 | 290 | 27 |
| 4 Ms CDF-S | Xue et al. (2011), Rangel et al. (2013), Brightman et al. (2014) | 154 | 90 | 64 | 14 |
| 7 Ms CDF-S | Luo et al. (2017), Li et al. (2020) | 110 | − | 110 | 64 |
| CDF-N | Xue et al. (2016), Li et al. (2020) | 61 | − | 61 | 37 |
| XMM-XXL | Pierre et al. (2016), Liu et al. (2016) | 2129 | 1910 | 219 | 19 |
| X-UDS | Kocevski et al. (2018) | 114 | 41 | 73 | 23 |
| Total | 5565 | 3660 | 1905 | 241 | |
Notes. The last three columns give the number of AGNs above the indicated obscuration limit in cm−2.
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