Long Term Evolution of Magnetized Bubbles in Galaxy Clusters

Abstract

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 $\sim 8\times 10^9$ years, and the initial magnetic bubble expansion is adiabatic. The bubble can survive for at least $8\times 10^9$ 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 $\sim 0.88$ $\mu$G at $\sim 8\times 10^9$ years. Finally, the initial bubble momentum and rotation have limited influence on the long term evolution of the bubble.

11 pages, 5 figures, accepted by ApJL. Minor changes according to the referee's report

References in corpus (21)

• Heating Hot Atmospheres with Active Galactic Nuclei
• Cluster Magnetic Fields
• A very deep Chandra observation of the Perseus cluster: shocks, ripples and conduction
• M87 at 90cm: A Different Picture
• Observations of extended radio emission in clusters
• An X-ray study of magnetic field strengths and particle content in FRII radio sources
• Radio and X-ray diffuse emission in six clusters of galaxies
• Magnetic Energy of the Intergalactic Medium from Galactic Black Holes
• Impact of tangled magnetic fields on AGN-blown bubbles
• Buoyant radio plasma in clusters of galaxies
• Magnetic fields in the Centaurus cluster
• Morphology of Rising Hydrodynamic and Magneto-hydrodynamic Bubbles from Numerical Simulations
• Modeling the Large Scale Structures of Astrophysical Jets in the Magnetically Dominated Limit
• MHD Simulations of Relic Radio Bubbles in Clusters
• Stability Properties of Magnetic Tower Jets
• Structure of Magnetic Tower Jets in Stratified Atmospheres
• On the Dynamics and Structure of Three-Dimensional Trans-Alfvenic Jets
• Cold filaments in galaxy clusters: effects of heat conduction
• On the Rayleigh-Taylor Instability of Radio Bubbles in Galaxy Clusters
• Dynamics and Structure of Three-Dimensional Trans-Alfvenic Jets. II. The Effect of Density and Winds
• Buoyant Bubbles in a Cooling Intracluster Medium I. Hydrodynamic Bubbles

Cited by in corpus (6)

• A wide Chandra view of the core of the Perseus cluster
• A Systematic Search for X-ray Cavities in the Hot Gas of Galaxy Groups
• Turbulence and Dynamo in Galaxy Cluster Medium: Implications on the Origin of Cluster Magnetic Fields
• Buoyant Bubbles in Intracluster Gas: Effects of Magnetic Fields and Anisotropic Viscosity
• Turbulence and the formation of filaments, loops and shock fronts in NGC 1275 in the Perseus Galaxy Cluster
• All Curled Up: A Numerical Investigation of Shock-Bubble Interactions and the Role of Vortices in Heating Galaxy Clusters