Recent high-energy detections and simultaneous broadband observations of blazars, determining their spectra and spectral variability, are posing strong con-straints on currently popular jet models of blazars. 66 blazars have been detected by EGRET at energies above 100 MeV [1], the two nearby high-frequency peaked BL Lac objects (HBLs) Mrk 421 a...

Jun 1, 2024 · Blazars are a special subclass of AGNs with a relativistic jet oriented at a small angle with respect to the line of sight. They usually show highly variable non-thermal emission throughout the entire electromagnetic spectrum from radio up to γ -ray bands.

Jul 29, 2024 · By employing multi-wavelength fitting with a one-zone synchrotron self-Compton model, we derive the parameters characterizing the magnetic field model within the jet, and investigate their impacts on the ALP constraints.

A blazar is an active galactic nucleus (AGN) with a relativistic jet (a jet composed of ionized matter traveling at nearly the speed of light) directed very nearly towards an observer. Relativistic beaming of electromagnetic radiation from the jet makes blazars appear much brighter than they would be if the jet were pointed in a direction away ...

Mar 21, 2022 · ExHaLe-jet is a kinetic, lepto-hadronic emission code, which models the radiation produced along the extended flow of a blazar jet. In this paper, we have introduced the code and provided a parameter study.

One of the primary goals of blazar studies is to determine how their jets form, collimate, and accelerate to relativistic flow speeds. Pursuit of this aim involves imaging in total and polarized intensity at submilliarcsecond resolution with very long baseline interferometry (VLBI).

Sep 27, 2016 · Here the author reviews many of the observations and theoretical ideas that have shaped his studies of blazars over about 40 years. This leads to his preferred scenario that blazar jets contain a helical magnetic field close to the black hole, turbulent plasma on parsecs scales, and both standing and moving shock waves.

Nov 22, 2021 · In this paper, the leptonic shock-in-jet blazar model of is extended with the addition of a self-consistent synchrotron mirror component. This was motivated by the difficulty in modeling orphan γ-ray flares with such an effectively single-zone model.

In this paper we consider the synchrotron and synchrotron-self-Compton emission from the jet, modelling the recent simultaneous multiwavelength observations of BL Lac. This is the first time these components have been fitted simultaneously for a blazar using a conical jet model.

I utilize first-principles physical concepts to create theoretical models of the primary emitting region of blazar jets, which help us to understand the physical properties behind broadband spectral emission and time variability signatures from these astrophysical powerhouses.