The mass-metallicity relation of type-2 AGNs at z ~ 3 comparing with MZR of star-forming galaxies. Gray solid curves are MZR of star-forming galaxies at z = 0.07, 0.7, and 2.2, and red curve is for z = 3.1 galaxies in Mannucci et al. (2009). Filled and open circles are same as Fig. 3, and the orange area denotes MZR of type-2 AGNs which NLR metallicities are estimated with high-nH models.
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