Correlation between the galaxies stellar mass and the central SMBHs mass. Observational data are taken from McConnell & Ma (2013) (dashed black line) and from Gaspari et al. (2019) (red circles). The simulated stellar masses for satellite galaxies (cyan points) are obtained considering the star particles bound to the substructure (accordingly to Subfind) and within 50 pkpc from its centre. The mass of the central galaxies (dark-blue squares) is obtained by summing over all stellar particles within an aperture of 0.15 × R₅₀₀.