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Magnetic Pressure Dominance Stabilizes AGN Disks Against Gravitational Instability
Hannalore J. Gerling-Dunsmore, Mitchell C. Begelman, Jacob B. Simon +1
Magnetic effects have long been considered a possible factor in stabilizing the outer regions of active galactic nuclei (AGN) accretion disks against gravitational instability (GI)…
Strongly magnetized accretion disks: structure and accretion from global magnetohydrodynamic simulations
Bhupendra Mishra, Mitchell C. Begelman, Philip J. Armitage +1
We use global magnetohydrodynamic simulations to study the influence of net vertical magnetic fields on the structure of geometrically thin () accretion disks in…
Strongly magnetized accretion discs require poloidal flux
Greg Salvesen, Philip J. Armitage, Jacob B. Simon +1
Motivated by indirect observational evidence for strongly magnetized accretion discs around black holes, and the novel theoretical properties of such solutions, we investigate how…
Accretion disc dynamo activity in local simulations spanning weak-to-strong net vertical magnetic flux regimes
Greg Salvesen, Jacob B. Simon, Philip J. Armitage +1
Strongly magnetized accretion discs around black holes have attractive features that may explain enigmatic aspects of X-ray binary behaviour. The structure and evolution of these d…
Quantifying energetics and dissipation in magnetohydrodynamic turbulence
Greg Salvesen, Kris Beckwith, Jacob B. Simon +2
We perform a suite of two- and three-dimensional magnetohydrodynamic (MHD) simulations with the Athena code of the non-driven Kelvin-Helmholtz instability in the subsonic, weak mag…
Turbulence in Global Simulations of Magnetized Thin Accretion Disks
Kris Beckwith, Philip J. Armitage, Jacob B. Simon
We use a global magnetohydrodynamic simulation of a geometrically thin accretion disk to investigate the locality and detailed structure of turbulence driven by the magnetorotation…