The Role of MHD in the ICM and its Interactions with AGN Outflows

Details The Role of MHD in the ICM and its Interactions with AGN Outflows The Role of MHD in the ICM and its Interactions with AGN Outflows

2007-08-17

arxiv.org/abs/0708.2284v1

Astronomy and Astrophysics

Astrophysics

12 pages, 1 figure. To be published in the proceedings of ``Extragalactic Jets: Theory and Observation from Radio to Gamma Ray

Scientific paper

Magnetic fields probably play a central role in the dynamics and thermodynamics of ICMs and their interactions with AGNs, despite the fact that the fields usually contribute relatively little pressure; i.e., the ICM is a ``high-$\beta$'' plasma. More typically, the roles of magnetic fields come through ``microscopic'' influences on charged particle behaviors, and through magnetic tension, which can still be significant in subsonic, high-$\beta$ flows. I briefly review these issues, while exploring the underlying question of using the commonly-applied magnetohydrodynamics model in the ICM when Coulomb scattering mean free paths can sometimes exceed tens of kiloparsecs.

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