Evidence for the Evolutionary Sequence of Blazars: Different Types of Accretion Flows in BL Lac Objects

Astronomy and Astrophysics – Astronomy

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Scientific paper

The distribution of line luminosity L_Hβ of 23 BL Lac objects suggests a bimodal nature. We found that standard thin disks are probably in the sources with L_Hβ > 10^41 erg s^-1. For the sources with L_Hβ < 10 ^41 erg s^-1, the accretion flows have transited from the standard^ thin disk type to the ADAF type. The results support the evolutionary sequence of blazars as being: FSRQ -> LBL -> HBL.

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