Influence of AGN jets on the magnetized ICM - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: Galaxy clusters are the largest structures for which there is observationalevidence of a magnetised medium. Central cores seem to host strong magneticfields ranging from a few 0.1 microG up to several 10 microG in cooling flowclusters. Numerous clusters harbor central powerful AGN which are thought toprevent cooling flows in some clusters. The influence of such feedback on themagnetic field remains unclear: does the AGN-induced turbulence compensate theloss of magnetic amplification within a cool core? And how is this turbulencesustained over several Gyr? Using high resolution magneto-hydrodynamicalsimulations of the self-regulation of a radiative cooling cluster, we study forthe first time the evolution of the magnetic field within the central core inthe presence of a powerful AGN jet. It appears that the jet-induced turbulencestrongly amplifies the magnetic amplitude in the core beyond the degree towhich it would be amplified by pure compression in the gravitational field ofthe cluster. The AGN produces a non-cooling core and increases the magneticfield amplitude in good agreement with microG field observations.



Author: Y. Dubois, J. Devriendt, A. Slyz, J. Silk

Source: https://arxiv.org/







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