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Hybrid magnetic structures around spinning black holes connected to a surrounding accretion disk

Published online by Cambridge University Press:  20 January 2023

I. El Mellah Open the ORCID record for I. El Mellah [Opens in a new window] ,
B. Cerutti ,
B. Crinquand  and
K. Parfrey
I. El Mellah
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG School of Mathematics, Trinity College Dublin
B. Cerutti
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG School of Mathematics, Trinity College Dublin
B. Crinquand
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG School of Mathematics, Trinity College Dublin
K. Parfrey
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG School of Mathematics, Trinity College Dublin
Rights & Permissions [Opens in a new window]

Abstract

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The hot accretion flow around Kerr black holes is strongly magnetized. Magnetic field loops sustained by a surrounding accretion disk can close within the event horizon. We performed particle-in-cell simulations in Kerr metric to capture the dynamics of the electromagnetic field and of the ambient collisionless plasma in this coupled configuration. We find that a hybrid magnetic topology develops with a closed magnetosphere co-existing with open field lines threading the horizon reminiscent of the Blandford-Znajek solution. Further in the disk, highly inclined open magnetic field lines can launch a magnetically-driven wind. While the plasma is essentially force-free, a current sheet forms above the disk where magnetic reconnection produces macroscopic plasmoids and accelerates particles up to relativistic Lorentz factors. A highly dynamic Y-point forms on the furthest closed magnetic field line, with episodic reconnection events responsible for transient synchrotron emission and coronal heating.

Keywords

acceleration of particlesmagnetic reconnectionblack hole physicsradiation mechanisms: non-thermalmethods: numerical
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 184 - 189
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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