High magnetization and flickering variability in relativistic MHD simulations create asymmetrical cocoons and broken jet morphologies in AGN jets.
Linear stability analysis of magnetized relativistic jets: the nonrotating case
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abstract
We perform a linear analysis of the stability of a magnetized relativistic non-rotating cylindrical flow in the aproximation of zero thermal pressure, considering only the m = 1 mode. We find that there are two modes of instability: Kelvin-Helmholtz and current driven. The Kelvin-Helmholtz mode is found at low magnetizations and its growth rate depends very weakly on the pitch parameter. The current driven modes are found at high magnetizations and the value of the growth rate and the wavenumber of the maximum increase as we decrease the pitch parameter. In the relativistic regime the current driven mode is splitted in two branches, the branch at high wavenumbers is characterized by the eigenfunction concentrated in the jet core, the branch at low wavenumbers is instead characterized by the eigenfunction that extends outside the jet velocity shear region.
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2D RMHD simulations show recollimation distance decreases monotonically with magnetization σ, converging to z_MHD/z_HD ∝ (B₀²/P_ext)^{-1/3} in the high-σ regime, with toroidal fields producing localized emission knots and poloidal fields shifting the zone downstream.
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The impact of flickering variability and magnetisation on the dynamics, stability and morphology of radio-loud AGN jets
High magnetization and flickering variability in relativistic MHD simulations create asymmetrical cocoons and broken jet morphologies in AGN jets.
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2D magnetohydrodynamic jet simulations: properties of recollimation shocks
2D RMHD simulations show recollimation distance decreases monotonically with magnetization σ, converging to z_MHD/z_HD ∝ (B₀²/P_ext)^{-1/3} in the high-σ regime, with toroidal fields producing localized emission knots and poloidal fields shifting the zone downstream.