General Physical Properties of Fermi blazars

TL;DR

This paper analyzes the physical properties of Fermi blazars using multiwavelength data and models to understand jet power, magnetic fields, and their relation to black hole characteristics.

Contribution

It provides a comprehensive analysis of Fermi blazars' physical parameters and their correlations, revealing differences between FSRQs and BL Lacs and their jet-accretion connections.

Findings

Jet power in FSRQs can be explained by the BP mechanism.

BL Lacs may have ADAFs around their black holes.

Jet power correlates with gamma-ray and radio luminosities.

Abstract

We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazar are fitted by using the one-zone leptonic model to obtain some physical parameters, such as jet power, magnetic field and Doppler factor. We study the distributions of the derived physical parameter as a function of black hole mass and accretion disk luminosity. The main results are as follows. (1) For a standard thin accretion disk, the jet kinetic power of most FSRQs can be explained by the BP mechanism. However, the jet kinetic power of most BL Lacs can not be explained by both the BZ mechanism or the BP mechanism. The BL Lacs may have ADAFs surrounding their massive black holes. (2) After excluding the redshift, there is a moderately strong correlation between the jet kinetic power and jet radiation power and the accretion disk luminosity for Fermi blazars. These results confirm a close connection between jet and accretion. The jet kinetic power is slightly larger than the accretion disk luminosity for Fermi blazars. (3) There is a significant correlation between jet kinetic power and gamma-ray luminosity and radio luminosity for Fermi blazars, which suggests that gamma-ray luminosity and radio luminosity can be used to indicate the jet kinetic power.