Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.36: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Particle Acceleration and Emission Signatures in Relativistic AGN Jets — •Nikita Nikita1, Frank Rieger1, Bhargav Vaidya2, and Frank Jenko1 — 1Max Planck Institute for Plasma Physics (IPP), Boltzmannstraße 2, 85748 Garching, Germany — 2DAASE, IIT Indore, Simrol, 453552, India
Relativistic outflows from AGNs can extend up to kilo-parsec scales, exhibiting complex morphologies. Using 3D relativistic magnetohydrodynamic (RMHD) simulations of rotating jet using PLUTO, we explore the role of dynamical instabilities in shaping complex jet morphologies and their synchrotron emission. Our analysis based on simulations of a continuously injected jet suggests that current-driven instabilities, notably the |m| = 1 mode, generate ribs-like structures that are seen in some of the recent radio galaxies using MeerKat. In the simulations of the restarted jet, the kink-instability driven ribs-like structures were formed closer to the nozzle. In both cases, the jet dissipates its magnetic energy through these instabilities, transitioning to a more kinetic energy dominant state. The synchrotron emission modeled in these simulations considers only diffusive shock acceleration. Stochastic acceleration, however, can become relevant in large-scale jets at sufficient magnetization, where strong shocks are absent, and turbulent magnetic fields dominate. As a next step, we aim to incorporate stochastic turbulent acceleration into PLUTO using a semi-analytical approach. These findings will contribute to a deeper understanding of the multi-scale processes driving particle acceleration and emission in AGN jets, bridging numerical simulations with observations.
Keywords: Active Galactic Nuclei; High Energy Astrophysics; Particle acceleration; Magnetohydrodynamical Simulations; Instabilities in Jets