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Formation of Precessing Jets by Tilted Black-hole Discs in 3D General Relativistic MHD Simulations

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arxiv 1707.06619 v4 pith:W43ELFEG submitted 2017-07-20 astro-ph.HE astro-ph.COgr-qc

Matthew Liska (1) , Casper Hesp (1) , Alexander Tchekhovskoy (2 , 3) , Adam Ingram (1) , Michiel van der Klis (1) , Sera Markoff (1) ((1) University of Amsterdam , (2) Berkeley
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(3) Northwestern)
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classification astro-ph.HEastro-ph.COgr-qc
keywords discdiscsjetstiltedalignmentmagneticprecessionrelativistic
verification ladder T0 review T1 audit T2 compute T3 formal
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Gas falling into a black hole (BH) from large distances is unaware of BH spin direction, and misalignment between the accretion disc and BH spin is expected to be common. However, the physics of tilted discs (e.g., angular momentum transport and jet formation) is poorly understood. Using our new GPU-accelerated code H-AMR, we performed 3D general relativistic magnetohydrodynamic simulations of tilted thick accretion discs around rapidly spinning BHs, at the highest resolution to date. We explored the limit where disc thermal pressure dominates magnetic pressure, and showed for the first time that, for different magnetic field strengths on the BH, these flows launch magnetized relativistic jets propagating along the rotation axis of the tilted disc (rather than of the BH). If strong large-scale magnetic flux reaches the BH, it bends the inner few gravitational radii of the disc and jets into partial alignment with the BH spin. On longer time scales, the simulated disc-jet system as a whole undergoes Lense-Thirring precession and approaches alignment, demonstrating for the first time that jets can be used as probes of disc precession. When the disc turbulence is well-resolved, our isolated discs spread out, causing both the alignment and precession to slow down.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole Disks

    gr-qc 2026-04 unverdicted novelty 8.0 of 10

    Tilted massive black hole disks develop persistent m=1 nonaxisymmetric modes, launch Blandford-Znajek jets whose collimation depends on spin orientation, and emit gravitational waves in the first self-consistent GRMHD...

  2. Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole Disks

    gr-qc 2026-04 conditional novelty 7.0 of 10

    In massive self-gravitating black hole disks, magnetic turbulence damps the m=1 instability and gravitational waves when aligned with the spin, but strongly enhances both when the disk is antialigned.

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  6. Polarization Signatures from GRMHD Simulations of Black Hole Accretion

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