A Study of Correlations between Redshifts and Spin Energies of Black Holes in AGN

We have collected a sample of 112 Blazars. Our sample includes 67 FRII Quasars, 11 FRII Radio-Loud Quasars, and 27 FRII cD galaxies. The Quasars and Radio-Loud Quasars have redshifts from about 0 to about 2. We have analyzed correlations between redshifts and spin energies of black holes for our sampled AGN. The spin energies were calculated using a set of assumptions. Our conclusions are as follows. (1) The spin energies of the sampled Blazars show appreciable correlations with redshifts; the correlations are most obvious if magnetic-field strengths (B)around the black holes are assumed to follow B=B_EDD; (2) The correlations are similar for different types of Blazars and for three different assumptions of magnetic-field strengths (, i.e., B=B_EDD, B=10⁴G, and B∝j_M); (3) The results suggest that spin energies statistically increase with redshifts for black holes in the redshift range of 0 to 3, which is consistent with independent studies of other authors.