Evolution of the AGN bias. Solid circles are the result obtained in this work by assuming no evolution in galaxy auto-correlation function for z = 0–3 and correcting the AGN–galaxy cross-correlation for the M_* evolution around AGNs. The dashed line represents the bias of the dark matter halos calculated using the relation of equation (33) (Sheth et al. 2001) for log (M_h/M_⊙) = 13.0, 12.5, and 12.0 from top to bottom. As a comparison, results obtained in literature are also plotted as labeled in the annotation. The results from Hickox et al. (2009); Krumpe et al. (2012) are derived from the AGN–galaxy cross-correlation, and those from Ross et al. (2009); Croom et al. (2005) are from AGN auto-correlation. (Color online)