Long Term Evolution of Magnetized Bubbles in Galaxy Clusters

Details Long Term Evolution of Magnetized Bubbles in Galaxy Clusters Long Term Evolution of Magnetized Bubbles in Galaxy Clusters

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dppup6020l&link_type=abstract

American Physical Society, 50th Annual Meeting of the Division of Plasma Physics, November 17-21, 2008, abstract #UP6.020

Physics

Plasma Physics

Scientific paper

We have performed nonlinear ideal magnetohydrodynamic simulations of the long term evolution of a magnetized low-density ``bubble" 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 x10^9 years, and the initial magnetic bubble expansion is adiabatic. The bubble can survive for at least 8 x10^9 years due to the stabilizing effect of the bubble magnetic field on Rayleigh-Taylor and Kelvin-Holmholtz 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 ˜0.57 μG at ˜8x10^9 years. Finally, the initial bubble momentum and rotation have limited influence on the long term evolution of the bubble.

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