Fig. 3.
αox vs. L2500 Å for z ≥ 6 QSOs. We compared our results with a compilation of optically selected QSOs at lower redshifts (Shemmer et al. 2006a; Steffen et al. 2006; Just et al. 2007; Lusso & Risaliti 2016). Downward pointing triangles represent upper limits. We also show the best-fitting relations of Just et al. (2007), Lusso & Risaliti (2016), and Martocchia et al. (2017). For visual purposes, we do not plot X-ray undetected sources included in the Lusso & Risaliti (2016) sample.
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