A study of a sequence of blazars from FSRQs to BL Lac objects

There are significant correlations between the broad line region luminosity LBLR, the quantity Δmax (maximum of Δ≡log[(Fν)cm/(Fν)mm]) and redshift z. There are strong correlations between the extended radio luminosity PE, LBLR and Δmax. Our results indicate that FSRQs with higher mass accretion rate Ṁ and black hole spin j occur in the earlier, highly luminous, violent phase of the galactic sequence, and BL Lacs with lower Ṁ and j occur in the lower luminous, later phase of the galactic sequence, while FR II BL Lacs are possible intermediate stages in the sequence of blazars from FSRQs to FR I BL Lacs with j lower than FR II BL Lacs. It is indicated that there is a disk-jet symbiosis in blazars.