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We apply magnetohydrodynamic (MHD) modeling to the radio galaxy Hercules Afor investigating the jet-driven shock, jet/lobe transition, wiggling, andmagnetic field distribution associated with this source. The model consists ofmagnetic tower jets in a galaxy cluster environment, which has been discussedin a series of our papers. The profile of underlying ambient gas plays animportant role in jet-lobe morphology. The balance between the magneticpressure generated by axial current and the ambient gas pressure can determinethe lobe radius. The jet body is confined jointly by the external pressure andgravity inside the cluster core radius R_c, while outside R_c it expandsradially to form fat lobes in a steeply decreasing ambient thermal pressuregradient. The current-carrying jets are responsible for generating a strong,tightly wound helical magnetic field. This magnetic configuration will beunstable against the current-driven kink mode and it visibly grows beyond R_cwhere a separation between the jet forward and return currents occurs. Thereversed pinch profile of global magnetic field associated with the jet andlobes produces projected B-vector distributions aligned with the jet flow andthe lobe edge. AGN-driven shock powered by the expanding magnetic tower jetsurrounds the jet/lobe structure and heats the ambient ICM. The lobes expandsubsonically; no obvious hot spots are produced at the heads of lobes. Severalkey features in our MHD modeling may be qualitatively supported by theobservations of Hercules A.

A Numerical Model of Hercules A by Magnetic Tower: Jet/Lobe Transition, Wiggling, and the Magnetic Field Distribution