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 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..dppxp8023l&link_type=abstract

American Physical Society, 51st Annual Meeting of the APS Division of Plasma Physics, November 2-6, 2009, abstract #XP8.023

Physics

Plasma Physics

Scientific paper

We have performed nonlinear ideal MHD 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 billion years, and the initial magnetic bubble expansion is adiabatic. The bubble can survive for at least 8 billion 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 0.88 micro Gauss at 8 billion years. Finally, the initial bubble momentum and rotation have limited influence on the long term evolution of the bubble.

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