Fig. 4
Synthetic emission maps of the reconfinement shock with jet Lorentz factor Γj = 10, opening angle Θj = 5° and external pressure index η = 0, filled with a helical magnetic field of different minimum pitch angle αB,m and seen from the viewing angle θobs = Θj. Dashed orange lines mark the turning point for polarization angle profiles in Fig. 5. See Fig. 1 for more explanation.
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