Table A.1.
Quasar properties.
| Name | RA | DEC | z | f2500Å | ΓX | L0.5 − 2 keV | L2 − 10 keV | f2keV |  |
#dof | texp | C/X | Ref. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) |
| ULAS J1120+0641 | 11h20m01.48s | +06d41m24.3s | 7.08 | 5.71 |  |
12 |
12 |
 |
1.16 | 36 | 2.3 | X | 1 |
| SDSS J114816.7+525150.4 | 11h48m16.65s | +52d51m50.2s | 6.43 | 0.842 |  |
3. |
8 |
 |
0.47 | 32 | 5 | X | 2 |
| SDSS 1030+0524 | 10h30m27.10s | +05d24m55.0s | 6.31 | 0.423 |  |
5 |
5 |
 |
1.07 | 156 | 103.8 | X | 3 |
| SDSS J010013.0+280225.9 | 01h00m13.02s | +28d02m55.8s | 6.30 | 6.94 |  |
100 |
59 |
 |
1.10 | 182 | 65.4 | X | 4 |
| SDSS 1623+3112 | 16h23m31.81s | +31d12m00.0s | 6.22 | 0.405 | 1.9 ( † ) | < 5 | < 4 | < 1.8 | 16.50 | 7 | 17.2 | C | 5 |
| SDSS 1602+4228 | 16h02m53.98s | +42d28m24.9s | 6.07 | 1.375 |  |
23 |
28 |
 |
1.00 | 26 | 13.2 | C | 5 |
| SDSS 1630+4012 | 16h30m33.90s | +40d12m09.6s | 6.05 | 0.282 |  |
9 |
10 |
 |
1.36 | 16 | 27.3 | C | 2 |
| SDSS 1306+0356 | 13h06m08.26s | +03d56m26.3s | 5.99 | 0.326 |  |
8 |
13 |
 |
0.79 | 91 | 119.7 | C | 6 |
| SDSS 1411+1217 | 14h11m11.29s | +12d17m37.4s | 5.93 | 0.376 |  |
18 |
16 |
 |
1.34 | 13 | 14.4 | C | 6 |
| SDSS 0836+0054 | 08h36m43.85s | +00d54m53.3s | 5.82 | 1.106 |  |
30 |
48 |
 |
0.96 | 24 | 5.7 | C | 6 |
| SDSS 0231−0728 | 02h31m37.65s | -07d28m54.5s | 5.41 | 1.24( ⋆ ) |  |
1.80 |
70 |
 |
1.08 | 20 | 4.2 | C | 7 |
| SDSS 1053+5804 | 10h53m22.99s | +58d04m12.1s | 5.21 | 1.51 ( ⋆ ) | 1.9 ( † ) | < 0.8 | < 20 | < 8.4 | 0.98 | 4 | 4.7 | C ( * )( ▵ ) | 7 |
| SDSS 2228−0757 | 22h28m45.15s | -07d57m55.4s | 5.14 | 0.68 ( ⋆ ) | 1.9 ( † ) | < 0.1 | < 4 | < 2.3 | 2.10 | 3 | 7.0 | C | 7 |
| SDSS 0756+4104 | 07h56m18.14s | +41d04m08.6s | 5.09 | 0.74 ( ⋆ ) |  |
1.0 |
22 |
 |
2.36 | 18 | 7.4 | C | 7 |
| SDSS 1204−0021 | 12h04m41.73s | -00d21m49.6s | 5.03 | 1.94 ( ⋆ ) |  |
0.6 |
13 |
 |
0.33 | 9 | 6.3 | C | 7 |
| SDSS J133422.63+475033.6 | 13h34m22.64s | +47d50m33.6s | 5.00 | 2.4 |  |
0.8 |
14 |
 |
1.31 | 18 | 11.6 | C | 7 |
| SDSS 2216+0013 | 22h16m44.00s | +00d13m48.3s | 4.99 | 0.67 ( ⋆ ) |  |
0.8 |
10 |
 |
0.64 | 7 | 7.5 | C | 8 |
| SDSS 0040−0915 | 00h40m54.65s | -09d15m26.8s | 4.98 | 2.5 ( ⋆ ) |  |
6 |
13 |
 |
1.07 | 139 | ( ‡ ) | X | 7 |
| SDSS 1026+4719 | 10h26m22.87s | +47d19m07.2s | 4.94 | 2.9 |  |
0.9 |
25 |
 |
1.12 | 5 | 2.3 | C ( ▵ ) | 7 |
| SDSS 1536+5008 | 15h36m50.26s | +50d08m10.3s | 4.93 | 3.0 |  |
1.8 |
27 |
 |
1.77 | 14 | 4.6 | C | 7 |
| SDSS J105123.04+354534.3 | 10h51m23.04s | +35d45m34.3s | 4.91 | 3.7 |  |
14 |
46 |
 |
1.34 | 62 | ( ‡ ) | X | 7 |
| SDSS J142103.83+343332.0 | 14h21m03.83s | +34d33m32.0s | 4.90 | 2.0 | 1.9 ( † ) | < 0.1 | < 3 | < 1.3 | 5.68 | 4 | 12.9 | C | 7 |
| SDSS J173744.88+582829.62 | 17h37m44.88s | +58d28m29.6s | 4.89 | 2.9 | 1.9 ( † ) | < 0.1 | < 3 | < 1.7 | 4.16 | 1 | 4.6 | C | 7 |
| SDSS 2225−0014 | 22h25m09.20s | -00d14m06.9s | 4.89 | 2.3 | 1.9 ( † ) | < 0.7 | < 7 | < 3.5 | 2.65 | 2 | 3.4 | C | 7 |
| SDSS 1023+6335 | 10h23m32.07s | +63d35m08.0s | 4.88 | 0.75 |  |
0.4 |
7 |
 |
0.66 | 4 | 4.7 | C | 7 |
| SDSS 0211−0009 | 02h11m02.70s | -00d09m10.3s | 4.87 | 0.17 ( ⋆ ) |  |
0.4 |
6 |
 |
2.76 | 4 | 4.9 | C | 8 |
| SDSS 0951+5945 | 09h51m51.19s | +59d45m56.2s | 4.86 | 0.83 | 1.9 ( † ) | < 0.8 | < 10 | < 3.5 | 5.45 | 3 | 5.1 | C | 7 |
| SDSS J075652.07+450258.86 | 07h56m52.08s | +45d02m58.9s | 4.83 | 0.68 | 1.9 ( † ) | < 5 | < 40 | < 2.1 | 9.20 | 3 | 7.0 | C | 7 |
| SDSS 0941+5947 | 09h41m08.36s | +59d47m25.7s | 4.82 | 1.78 |  |
0.8 |
14 |
 |
1.65 | 11 | 4.2 | C | 7 |
| SDSS J142705.86+330817.9 | 14h27m05.86s | +33d08m18.0s | 4.71 | 2.8 |  |
1.5 |
21 |
 |
3.98 | 8 | 5.0 | C( ▵ ) | 7 |
| PSS 1347+4956 | 13h47m43.29s | +49d56m21.3s | 4.51 | 5.8 |  |
5 |
34 |
 |
0.77 | 28 | 5.9 | C | 7 |
| SDSS 1302+0030 | 13h02m16.13s | +00d30m32.1s | 4.50 | 0.87 | 1.9 ( † ) | < 0.8 | < 7 | < 1.5 | 3.91 | 2 | 10.8 | C | 7 |
| PSS 0808+5215 | 08h08m49.43s | +52d15m15.3s | 4.44 | 3.8 |
 |
0.7 |
9 |
 |
1.70 | 7 | 4.9 | C | 7 |
| BRI 0103+0032 | 01h06m19.24s | +00d48m23.3s | 4.44 | 3.7 |
 |
5 |
43 |
 |
3.44 | 20 | 3.7 | C | 7 |
| SDSS 0831+5235 | 08h31m03.01s | +52d35m33.5s | 4.44 | 1.78 |
 |
9 |
9 |
 |
1.02 | 502 | ( ‡ ) | X | 7 |
| PSS 1443+2724 | 14h43m31.18s | +27d24m36.8s | 4.44 | 2.2 |
 |
3 |
23 |
 |
4.23 | 8 | 2.2 | C | 7 |
| SDSS 1401+0244 | 14h01m46.53s | +02d44m34.7s | 4.44 | 3.7 |
 |
12 |
26 |
 |
1.19 | 613 | ( ‡ ) | X | 7 |
| PSS 0747+4434 | 07h47m49.74s | +44d34m17.0s | 4.43 | 1.31 |
 |
1.3 |
10 |
 |
1.35 | 6 | 4.5 | C | 7 |
| BR 1600+0724 | 16h03m20.89s | +07d21m04.5s | 4.38 | 5.9 |
 |
3 |
12 |
 |
3.78 | 6 | 4.6 | C | 7 |
| SDSS 2357+0043 | 23h57m18.36s | +00d43m50.4s | 4.36 | 1.22 |
 |
0.7 |
9 |
 |
2.43 | 18 | 12.8 | C | 7 |
| PSS 1317+3531 | 13h17m43.13s | +35d31m31.8s | 4.34 | 0.79 |
 |
2.0 |
7 |
 |
0.39 | 2 | 2.8 | C | 7 |
| PSS 0955+5940 | 09h55m11.33s | +59d40m30.6s | 4.34 | 3.5 |
 |
5 |
31 |
 |
1.53 | 11 | 43.6 | C | 7 |
| SDSS 0050−0053 | 00h50m06.35s | −00d53m19.3s | 4.33 | 3.2 |
 |
0.8 |
12 |
 |
2.39 | 21 | 13.1 | C | 7 |
| PSS 0957+3308 | 09h57m44.46s | +33d08m20.8s | 4.20 | 6.0 |
 |
1.6 |
20 |
 |
0.59 | 16 | 6.1 | C | 7 |
| PSS 0059+0003 | 00h59m22.66s | +00d03m01.4s | 4.18 | 1.77 |
 |
1.4 |
17 |
 |
3.13 | 10 | 2.7 | C | 7 |
| SDSS 1444−0123 | 14h44m28.63s | −01d23m44.0s | 4.18 | 1.10 |
 |
3 |
7 |
 |
3.87 | 29 | 10.1 | C | 7 |
| PSS 0133+0400 | 01h33m40.30s | +04d00m59.9s | 4.15 | 2.3 ( ⋆ ) |
 |
4.2 |
30 |
 |
1.06 | 136 | 65.0 | C | 8 |
| PSS 0209+0517 | 02h09m44.59s | +05d17m13.3s | 4.14 | 3.7 ( ⋆ ) |
 |
6 |
26 |
 |
1.60 | 21 | 5.8 | C | 8 |
| PSS 1057+4555 | 10h57m56.26s | +45d55m53.0s | 4.14 | 17.5 |
 |
8 |
48 |
 |
3.87 | 29 | 2.8 | C | 7 |
| PSS 1326+0743 | 13h26m11.85s | +07d43m58.4s | 4.09 | 12.0 |
 |
9 |
55 |
 |
0.89 | 57 | ⋄ | C | 7 |
| SDSS 1413+0000 | 14h13m15.37s | +00d00m32.4s | 4.08 | 1.32 |
 |
1.4 |
10 |
 |
1.48 | 19 | 12.5 | C | 7 |
| SDSS J111812.91+441122.3 | 11h18m12.91s | +44d11m22.3s | 4.02 | 1.65 |
 |
5 |
12 |
 |
1.13 | 600 | ( ‡ ) | X | 7 |
| SDSS 1408+0205 | 14h08m50.91s | +02d05m22.7s | 4.01 | 3.3 |
 |
9 |
41 |
 |
0.76 | 29 | 6.0 | C | 7 |
Notes. Columns: (1) Source name. (2) Right ascension (RA) in the J2000 frame. (3) Declination (Dec) in the J2000 frame. (4) Archival source redshift. (5) Rest-frame 2500 Å flux density, in unity of 10−28 erg s−1 cm−2 Hz−1. Uncertainties are assumed to be about the 22% of the flux. See Sect. 4 for details. (6) Rest-frame 0.5–2 keV luminosity in units of 1044 erg s−1. (7) Rest-frame 2–10 keV luminosity in units of 1044 erg s−1. (8) X-ray spectral photon index, evaluated through the fitting procedure (see Sect. 3). (9) Rest-frame 2 keV flux density, in unity of 10−32 erg s−1 cm−2 Hz−1. See Sect. 3 for details. (10) Reduced χ2 of the X-ray spectral fit procedure. (11) Number of degrees of freedom in the X-ray spectral fit, i.e. the number of spectral bins minus the number of the free parameters. For the detected sources, the free parameters are the power-law slope and normalisation. (12) Exposure time of the X-ray observation in units of ks. (13) Telescope used for this observation: C for Chandra, X for XMM-Newton. ( ⋆ )Extrapolation of the rest-frame 2500 Å flux density through fixed slope on SDSS DR7 or DR12 data. Numbers in column 5: Extrapolation through a fixed slope on archival observations: (1) Mortlock et al. 2011, (2) Iwamuro et al. 2004, (3) Hjorth et al. 2013, (4) Wu et al. 2015, (5) Gallerani et al. 2010, (6) Jiang et al. 2007, (7) Shen et al. 2011, (8) Pâris et al. 2017. ( † )Upper limit on X-ray monochromatic flux estimate. ( * )Off-axis sources. ( ▵ )Sources detected using ACIS-I camera. All of the others were observed using ACIS-S. ( ‡ )Multiple X-ray observations fitted together.
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