Fig. 5.
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Total observed [O III] luminosity (L[O III]) of PDS 456 (red star) compared with that measured for other samples of Type 1 quasars in the redshift range z ∼ 0.1 to ∼4. The quasars at z < 1 are from Husemann et al. (2013; green dots), Husemann et al. (2014; yellow dots), Liu et al. (2014; purple dots), and Perna et al. (2017; orange dots). Quasars at z > 1 are from Coatman et al. (2019; blue dots) and Bischetti et al. (2017; red dots).
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