# FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars

## TL;DR

This paper proposes a unified model for blazar classification based on magnetized, advective accretion flows, explaining differences between FSRQs and BL Lacs through magnetic field strength and accretion rate effects.

## Contribution

It introduces a magnetized, advective disc-outflow model with explicit cooling to unify blazar types by linking accretion dynamics and magnetic fields.

## Key findings

- BL Lacs are more optically thin and magnetically dominated than FSRQs.
- The model explains the correlation between disc luminosity and jet luminosity.
- Magnetic fields influence jet formation and emission properties.

## Abstract

The $Fermi$ blazar observations show a strong correlation between $\gamma$-ray luminosities and spectral indices. BL Lac objects are less luminous with harder spectra than flat-spectrum radio quasars (FSRQs). Interestingly FSRQs are evident to exhibit a Keplerian disc component along with a powerful jet. We compute the jet intrinsic luminosities by beaming corrections determined by different cooling mechanisms. Observed $\gamma$-ray luminosities and spectroscopic measurements of broad emission lines suggest a correlation of the accretion disc luminosity with jet intrinsic luminosity. Also, theoretical and observational inferences for these jetted sources indicate a signature of hot advective accretion flow and a dynamically dominant magnetic field at jet-footprint. Indeed it is difficult to imagine the powerful jet launching from a geometrically thin Keplerian disc. We propose a magnetized, advective disc-outflow symbiosis with explicit cooling to address a unified classification of blazars by controlling both the mass accretion rate and magnetic field strength. The large scale strong magnetic fields influence the accretion dynamics, remove angular momentum from the infalling matter, help in the formation of strong outflows/jets, and lead to synchrotron emissions simultaneously. We suggest that the BL Lacs are more optically thin and magnetically dominated than FSRQs at the jet-footprint to explain their intrinsic $\gamma$-ray luminosities.