Jet/accretion and Unification for FSRQs/FRII and BL Lac objects/FRI radio galaxies

TL;DR

This study analyzes the relationships between jet power, black hole mass, and broad-line luminosity across different types of radio-loud active galactic nuclei, supporting unification models and linking jet activity to accretion processes.

Contribution

It provides empirical evidence for the unification of FSRQs with FRII galaxies and BL Lacs with FRI galaxies, and quantifies the correlation between jet power and broad-line luminosity.

Findings

FSRQs are separated from BL Lacs by the FRI/FRII dividing line.

Strong correlation between broad line luminosity and jet power.

Supports the unification model of radio-loud AGNs.

Abstract

We compiled a sample of 24 flat-spectrum radio quasars (FSRQs), 21 BL Lacs, 13 FRI and 12 FRII radio galaxies to study the jet power and broad-line luminosity relation, and the jet power and black hole mass relation. Furthermore, we obtain the histograms of key parameters. Our main results are as the follows:(i) We found that the FSRQs are roughly separated from BL Lacs by the Ledlow-Owen FRI/FRII dividing line in the $\rm{\log{P_{jet}}-\log{M}}$ plane. This result supports the unification model that BL Lacs unify with FRI radio galaxies and FSRQs unify with FRII radio galaxies.(ii)We found that the coefficient of the best-fit linear regression equation of $\rm{\log{L_{BLR}}-\log{P_{jet}}}$ relation is very close to 1 for our sample. The correlation between broad line luminosity and jet power is significant which supports that jet power has a close link with accretion.