(a) Rest-frame 1.4 GHz radio luminosity and (b) the absolute i-band magnitude at the rest frame as a function of redshift. Yellow and blue circles represent SDSS-detected RGs (Best & Heckman 2012) and RGs discovered by the VLA-COSMOS project (Smolčić et al. 2017a), respectively. Red circles represent HSC–FIRST RGs with reduced χ2 ≤ 5.0.