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Table 1.

High-z blazars and candidates with bibliographical information.

No. Name RA (J2000) Dec (J2000) z MBH (M⊙) Ldisk (erg/s) Ṁ/ṀEdd Method Ref.
1 PSO J0309+27 10:26:23.62 +25:42:59.43 6.10 1 . 45 − 0.85 + 1.89 × 10 9 Mathematical equation: $ 1.45^{+1.89}_{-0.85} \times 10^{9} $ 8 × 1046 0.22a spec (1)
2 B2 1023+25 10:26:23.62 +25:42:59.43 5.30 2.8 × 109 9 × 1046 0.25 sed (2)
3 SDSS J0131–0321 01:31:27.31 –03:20:59.63 5.18 1.1 × 1010 4.2 × 1047 0.25 sed (3)
2 . 7 + 0.5 − 0.4 × 10 9 Mathematical equation: $ 2.7^{-0.4}_{+0.5}\times 10^9 $ 1 . 1 − 0.2 + 0.2 × 10 48 Mathematical equation: $ 1.1^{+0.2}_{-0.2} \times 10^{48} $ 3.14 spec (4)
4 GB6 B1428+4217 14:30:23.74 +42:04:36.49 4.715 1.7 × 109 2 × 1047 – sed (5)
7.4 × 109 2 × 1047 0.9 spec (10)
1.7 × 109 2 × 1047 0.2 spec (10)
5 PMN J2134–0419 21:34:12.01 –04:19:09.87 4.35 1.8 × 109 9.5 × 1046 0.35 sed (6)
6 J151002+570243 15:10:2.92 +57:02:43.38 4.31 6.5 × 109 7.1 × 1046 0.09 sed (7)
1.5 × 1010 4 × 1047 0.21 sed (8)
3 × 108 – – spec (9)
3 × 109 4.5 × 1046 0.12 sed (9)
8.8 × 108 1.5 × 1047 1.3 spec (10)
7 J222032.50+002537.5 22:20:32.50 +00:25:37.51 4.22 2 × 109 4.5 × 1046 0.15 sed (6)
8 J142048.01+120545.9 14:20:48.01 +12:05:45.98 4.03 2 × 109 5.3 × 1046 0.18 sed (6)
9 J135406–020603 13:54:6.90 –02:06:4.00 3.71 109 5.5 × 1046 0.43 sed (7)
8.9 × 108 – – spec (9)
10 J020346+113445 02:03:46.70 +11:34:44.00 3.63 3 × 109 5.5 × 1046 0.14 sed (7)
11 J013126–100931 01:31:26.71 –10:09:31.17 3.51 6 × 109 5.0 × 1046 0.06 sed (7)
12 J064632+445116 06:46:32.03 +44:51:16.59 3.41 1.5 × 109 1.4 × 1047 0.74 sed (7)
1.3 × 109 – – spec (9)
4 × 109 1.3 × 1047 0.26 sed (9)
13 S5 0014+813 00:17:08.47 +81:35:08.13 3.366 4 × 1010 3 × 1048 0.5 sed (11)
14 J212912–153841 21:29:12.10 –15:38:42.00 3.26 5 × 109 5.1 × 1047 0.79 sed (7)
1010 7.5 × 1047 0.5 sed (11)
13 . 4 − 2.4 + 2.4 × 10 9 Mathematical equation: $ 13.4^{+2.4}_{-2.4}\times 10^9 $ 1.8 × 1048 1.05 spec (12)
6.3 × 109 – – spec (9)
7 × 109 6 × 1047 0.68 sed (9)
15 PKS 0537–286 05:39:54.28 –28:39:55.95 3.104 2 × 109 5.4 × 1046 0.18 sed (11)
16 GB6 0805+614 08:05:18.18 +61:44:23.70 3.033 1.5 × 109 3.4 × 1046 0.15 sed (11)
17 PKS 0519+01 05:22:17.47 +01:13:31.18 2.94 4.5 × 109 2.36 × 1046 0.035 sed (13)
18 PMN J1344–1723 13:44:14.40 –17:23:40.39 2.49 1.5 × 109 1.23 × 1046 0.055 sed (13)
19 TXS 1149–084 11:52:17.21 –08:41:03.31 2.37 1.5 × 109 3.15 × 1046 0.14 sed (13)
20 PKS 2149–306 21:51:55.52 –30:27:53.70 2.345 5 × 109 1.5 × 1047 0.2 sed (11)
21 4C 71.07 08:41:24.37 +70:53:42.17 2.172 3 × 109 2.25 × 1047 0.5 sed (11)
22 PKS 0227–369 02:29:28.45 –36:43:56.82 2.12 2 × 109 3 × 1046 0.1 sed (14)
23 PKS 0528+134 05:30:56.42 +13:31:55.15 2.04 109 7.5 × 1046 0.5 sed (14)

Notes. (a)Belladitta et al. (2022) report an Eddington ratio of ∼0.44 using the bolometric luminosity. Because they estimate the disk luminosity to be approximately half of Lbol, the corresponding Eddington ratio based on Ldisk is ∼0.22, which we adopt here. (1) Belladitta et al. (2022), (2) Sbarrato et al. (2013), (3) Ghisellini et al. (2015), (4) Yi et al. (2014), (5) Gokus et al. (2025), (6) Sbarrato et al. (2015), (7) Marcotulli et al. (2020), (8) Gokus et al. (2024), (9) Ackermann et al. (2017), (10) Diana et al. (2022), (11) Ghisellini et al. (2010), (12) Dietrich & Hamann (2004), (13) Ghisellini et al. (2013), (14) Ghisellini et al. (2011).

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