Left: Radio luminosity function versus redshift for the group galaxies (black circles), brightest group galaxies BGGs (red squares), and satellite galaxies SGs (yellow stars). Cyan lines show the Φ_* values at log${}_{10}(L_{1.4\mathrm{GHz}}/{\mathrm{W}\mathrm{Hz}}^{-1})=24$ for each redshift bin; these values were placed one dex lower for presentation reasons. The values plotted here are reported in Table A.5 for γ = −0.75. Right: Relative contribution of GGs to total radio luminosity, as described in Sect. 3.3.1 for the scaled fit (open symbols) and in Sect. 3.3.2 for the power-law, linear-regression fit (violin plots) versus redshift. The values in the violin plots show the distribution of fractions along our adopted luminosity range. Black circles denote GGs, red squares denote BGGs, and yellow stars denote SGs. A halo mass cut, log₁₀(M_200c/M_⊙) > 13.5, was applied.