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Non-thermal emission from Active Galactic Nuclei (AGN) jets extends up-tolarge scales in-spite of them being prone to a slew of magneto-hydrodynamicinstabilities. The main focus of this study is to understand the impact of MHDinstabilities on the non-thermal emission from large-scale AGN jets. We performhigh-resolution three-dimensional numerical magneto-hydrodynamic simulations ofa plasma column to investigate the dynamical and emission properties of jetconfigurations at kilo-parsec scales with different magnetic field profiles,jet speeds, and density contrast. We also obtain synthetic non-thermal emissionsignatures for different viewing angles using an approach that assumes staticparticle spectra and that obtained by evolving the particle spectra usingLagrangian macro-particles incorporating the effects of shock acceleration andradiative losses. We find that the shocks due to Kelvin-Helmholtz (KH)instability in the axial magnetic field configurations can strongly affect thejet dynamics. Additionally, we also find the presence of weak biconical shocksin the under-dense jet columns. The inclusion of a helical magnetic fieldhinders the vortex growth at the shear surface thereby stabilizing the jetcolumn. With the evolving particle spectra approach, the synthetic SEDsobtained for cases with strong KH instability show the presence of multiplehumps ranging from radio to TeV gamma-ray band. We conclude that thehigh-energy electrons accelerated in the vicinity of freshly formed shocks dueto KH instability, result in high X-ray emission.

Numerical study of Kelvin-Helmholtz instability and its impact on synthetic emission from magnetized jets