Haojing Zhang

The jets-accretion relation, mass-luminosity relation in Fermi blazars

A sample of 111 Fermi blazars each with a well-established radio core luminosity, broad-line luminosity, bolometric luminosity and black hole mass has been compiled from the literatures. We present a significant correlation between radio core and broad-line emission luminosities that supports a close link between accretion processes and relativistic jets. Analysis reveals a relationship of

Core-dominance parameter, black hole mass and jet-disc connection for Fermi blazars

\mathrm{Log}\mathrm{L}_{\mathrm{BLR}}\sim(0.81\pm0.06)\mathrm{Log} \mathrm{L}_{\mathrm{R}}^{\mathrm{C}}

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

which is consistant with theoretical predicted coefficient and supports that blazar jets are powered by energy extraction from a rapidly spinning Kerr black hole through the magnetic field provided by the accretion disk. Through studying the correlation between the intrinsic bolometric luminosity and the black hole mass, we find a relationship of

The physical properties of Fermi TeV BL Lac objects’ jets

\mathrm{Log}\frac{\mathrm{L}_{\mathrm{in}}}{\mathrm{L}_{\odot}}=(0.95\pm0.26)\mathrm{Log} \frac{\mathrm{M}}{\mathrm{M}_{\odot}}+(3.53\pm2.24)

Multicolor Optical Monitoring of the Quasar 3C 273 from 2005 to 2016

which supports mass-luminosity relation for Fermi blazars derived in this work is a powerlaw relation similar to that for main-sequence stars. Finally, EVOLUTIONARY SEQUENCE OF BLAZARS is discussed.

MULTI-COLOR OPTICAL MONITORING OF MRK 501 FROM 2010 TO 2015

We study the relationship between jet power and accretion for Fermi and non-Fermi blazars, respectively. We also compare the relevant parameter between them. Our main results are as follows. (i) Fermi and non-Fermi blazars have significant difference in redshift, black hole mass, and broad line luminosity. (ii) Fermi blazars have higher average core-dominance parameter than non-Fermi blazars, which suggests that Fermi blazars have strong beaming effect. (iii) We find significant correlation between broad line emission and jet power for Fermi and non-Fermi blazars, respectively, which suggests a direct tight connection between jet and accretion. (iv) The accretion and black hole mass may have a different contribution to jet power for Fermi and non-Fermi blazars, respectively.

Fermi gamma-ray and multi-wave band emission from TeV active galactic nuclei

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 follows: (i) We found that the FSRQs are roughly separated from BL Lacs by the Ledlow–Owen FRI/FRII dividing line in the logPjet–logM 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 logLBLR–logPjet 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.

Basic properties of Fermi blazars and the 'blazar sequence'

We investigate the physical properties of \textit{Fermi} TeV BL Lac objects jets by modeling the quasi-simultaneous spectral energy distribution of 29 \textit{Fermi} TeV BL Lacs in the frame of a one-zone leptonic synchrotron self-Compton model. Our main results are the following: (i) There is a negative correlation between

From the 'blazar sequence' to unification of blazars and radio galaxies

B

Correlation between X-ray and γ-ray for Fermi blazars

and