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The Impact of Resistivity on the Variability of Black Hole Accretion Flows by Nathanail, Antonios; Mizuno, Yosuke; Contopoulos, Ioannis; Fromm, Christian M.; Cruz-Osorio, Alejandro; Moriyama, Kotaro; Rezzolla, Luciano is a scholarly article available to read on EtoBox.

What is The Impact of Resistivity on the Variability of Black Hole Accretion Flows about?

Context. The accretion of magnetized plasma onto black holes is a complex and dynamic process, where the magnetic field plays a crucial role. The amount of magnetic flux accumulated near the event horizon significantly impacts the accretion flow behavior. Resistivity, a measure of how easily magnetic fields can dissipate, is thought to be a key factor influencing this process. This work explores the influence of resistivity on accretion flow variability. We investigate simulations reaching the magnetically arrested disk (MAD) limit and those with an initial multi-loop magnetic field configuration. Methods. We employ 3D resistive general relativistic magnetohydrodynamic (GRMHD) simulations to model the accretion process under various regimes, where resistivity has a global uniform value. Results. Our findings reveal distinct flow behaviors depending on resistivity. High resistivity simulations never achieve the MAD state, indicating a disturbed magnetic flux accumulation process. Conversely, low resistivity simulations converge towards the ideal MHD limit. The key results are: i) For the standard MAD model, resistivity plays a minimal role in flow variability, suggesting that flux e

Author

Nathanail, Antonios; Mizuno, Yosuke; Contopoulos, Ioannis; Fromm, Christian M.; Cruz-Osorio, Alejandro; Moriyama, Kotaro; Rezzolla, Luciano

Published

2024

Language

EN