Table 1.
Summary of sample statistics.
| Sample | Initial | Main | Selected | Reference |
|---|---|---|---|---|
| (1) | (2) | (3) | ||
| XMM–Newtonz ≃ 3 | 29 | 29 | 14 | 1 |
| XMM–Newtonz ≃ 4 | 1 | 1 | 1 | 2 |
| High-z | 64 | 64 | 35 | 3 |
| XXL | 840 | 840 | 106 | 4 |
| SDSS–4XMM | 13 800 | 9252 | 1644 | 5 |
| SDSS–Chandra | 7036 | 2392 | 608 | 6 |
| Local AGN | 15 | 15 | 13 | 7 |
| Total | 21 785 | 12 593 | 2 421 | |
Notes. (1) These number counts refer to the sample statistics before correcting for overlaps amongst the sub-samples. (2) Sample statistics after accounting for overlaps and the quality pre-selection described in Sect. 7. The order of priority decreases from the top to the bottom row. (3) Sample statistics in the final cleaned quasar sample after the various filtering steps: see Sect. 7 for details.
References. Various samples: 1: Nardini et al. (2019); 2: see Sect. 2.5; 3: Salvestrini et al. (2019) and Vito et al. (2019); 4: Menzel et al. (2016); 5: see Sect. 2.1; 6: Bisogni et al. (in prep.); 7: Sect. 2.7.
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