Abstract
We have performed nonlinear ideal magnetohydrodynamic simulations of the long-term evolution of a magnetized low-density plasma formed by a radio galaxy in a stratified cluster medium. It is found that about 3.5% of the initial magnetic energy remains in the bubble after ~8 × 109 yr, and the initial magnetic bubble expansion is adiabatic. The bubble can survive for at least 8 × 109 yr due to the stabilizing effect of the bubble magnetic field on Rayleigh-Taylor and Kelvin-Helmholtz instabilities, possibly accounting for ghost cavities as observed in Perseus A. A filament structure spanning about 500 kpc is formed along the path of bubble motion. The mean value of the magnetic field inside this structure is ~0.88 μG at ~8 × 109 yr. Finally, the initial bubble momentum and rotation have limited influence on the long-term evolution of the bubble.
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