Multi-Zone Blazar Modelling

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Blazars are a relativistic gas outflow associated with Active Galactic Nucleiand with the characteristic of being extremely high in luminosity. They areknown to be related to galaxy evolution and to cosmic rays and neutrinos.Because of this, and their extreme physics, they are in a position ofimportance among high-energy astrophysical sources. Due to the Fermi X-rayand Fermi gamma-ray satellites, the amount of data available for this kindof objects has increased significantly, and with that, the variety ofresearch that can be done.Until now, modelling of blazars has been done mostly using simplified"one-zone" models, assuming a single dominant emission site, which alreadycan explain some of the processes that occur in blazars. But because of theincrease in computational power and numerical techniques, we are now ableto move beyond those models to more complex models, multi-zone models inparticular, capable of describing recent high-quality data.Early versions of such new models are already demonstrating an improved fitto the observational data. But they separate leptonic and hadronic modelsfor the dominant emitting particle species, and the study of the continuumand the variability. Our objective is to merge numerically thedifferent approaches.Research will start with literature study and numerically reproducing ofpast results through a radiation code developed in-house. After that we willtest the effect of geometry and that of extending emission to multipleanalytically modeled discrete zones and interacting emitting shells.We will continue by simulating outflows in one and two dimensions, movingfrom analytically to numerically computed dynamics, and by graduallyincreasing the complexity by including more kinds of particles and processes.