Relationship Between the Spins and Masses of Supermassive Black Holes in Distant Active Galactic Nuclei with z > 4

Hybrid models for the generation of relativistic jets are used to place constraints on the spins of supermassive black holes (SMBHs) in active galactic nuclei at redshifts z > 4.0. It is shown that these SMBHs possess spins that are far from the limiting Kerr value. Mass-spin diagrams show that, on average, the spin grows with the mass of the black hole. The results obtained can be compared to the results of numerical simulations of the evolution of the masses and spins of SMBHs, opening the possibility of studies of the character of the accretion in the galaxies hosting these objects.