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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.108: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

Particle Acceleration and Emission Signatures in Relativistic AGN Jets — •Nikita Nikita, Frank Rieger, and Frank Jenko — Max Planck Institut für Plasmaphysik

Relativistic jets from active galactic nuclei (AGNs) are among the most energetic phenomena in the universe, extending over kilo-parsec scales and interacting with their surrounding environment in highly complex ways. These jets develop complex structures through different MHD instabilities and turbulence, which strongly influence non-thermal particle acceleration in these systems. Using 3D RMHD simulations with PLUTO, we investigate jet-driven turbulence as a site for stochastic (second-order Fermi) acceleration in regimes where strong shocks are absent and magnetization is sufficient for stochastic processes to become relevant . We explore a semi-analytical treatment of turbulent acceleration and examine how different prescriptions for momentum diffusion coefficients and escape timescales shape the particle energization and the resulting spectra. By coupling these models to synthetic synchrotron emission, we aim to examine how variations in diffusion physics manifest in observable radio signatures from active galaxies, providing new constraints on the physical processes underlying particle acceleration in large-scale AGN jets.

Keywords: Active Galactic Nuclei; High Energy Astrophysics; Stochastic Acceleration; Magnetohydrodynamical simulations; Relativistic Jets