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AGN Jets : An Ideal platform to study Multi Messenger Astronomy.
The dawn of multi-messenger astronomy is upon us with the advent of several observatories aiming to detect extra-galactic signals beyond the electro-magnetic spectrum. Powerful jets from Active Galactic Nuclei (AGNs) form an ideal testbed for Multi-Messenger Astronomy. They are essentially collimated beams of plasma launched from the vicinity of the central black hole and cover a large span in length scales. As they traverse these scales, jets undergo interaction with the ambient medium within and outside the galaxy core. Additionally as these jets are threaded with magnetic fields, they are prone to various magneto-hydrodynamic instabilities that have the potential to disrupt the structure of the jet. In-spite of these effects, jets tend to maintain a stable beam like structure as evident from multi-wavelength emission signatures. Further, jets from AGNs play a fundamental role in accelerating particles upto very high energies through multiple processes including shocks, turbulence and reconnection. The goal is to understand the dynamical impact of these instabilities and how they govern the particle acceleration processes and associated non-thermal emission. The focus of my talk would be our recent results from 3D Relativistic MHD simulations of plasma columns to study the dynamical aspects of kink and kelvin helmholtz instability prevalent at kilo-parsec and parsec scales. Synthetic emission signatures from these simulations obtained from newly developed multi-zone post-processing model and hybrid Eulerian Lagrangian framework will be presented. The influence of these various MHD instabilities on particle acceleration and its implication on observations will be discussed.