SIMBAD references

2008ApJ...684L..57L - Astrophys. J., 684, L57-L60 (2008/September-2)

Long-term evolution of magnetized bubbles in galaxy clusters.

LIU W., LI H., LI S. and HSU S.C.

Abstract (from CDS):

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 ∼8x109 yr, and the initial magnetic bubble expansion is adiabatic. The bubble can survive for at least 8x109 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 ∼8x109 yr. Finally, the initial bubble momentum and rotation have limited influence on the long-term evolution of the bubble.

Abstract Copyright:

Journal keyword(s): Galaxies: Jets - Magnetic Fields - Methods: Numerical - Magnetohydrodynamics: MHD

Simbad objects: 4

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