Video URL

https://pirsa.org/24010071

Jets with a Twist: Magnetized Spherical Accretion onto a Rapidly Spinning BH - VIRTUAL

Lalakos, A. (2024). Jets with a Twist: Magnetized Spherical Accretion onto a Rapidly Spinning BH - VIRTUAL. Perimeter Institute for Theoretical Physics. https://pirsa.org/24010071

Lalakos, Aretaios. Jets with a Twist: Magnetized Spherical Accretion onto a Rapidly Spinning BH - VIRTUAL. Perimeter Institute for Theoretical Physics, Jan. 11, 2024, https://pirsa.org/24010071 

          @misc{ scivideos_PIRSA:24010071,
            doi = {10.48660/24010071},
            url = {https://pirsa.org/24010071},
            author = {Lalakos, Aretaios},
            keywords = {Strong Gravity},
            language = {en},
            title = {Jets with a Twist: Magnetized Spherical Accretion onto a Rapidly Spinning BH - VIRTUAL},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {jan},
            note = {PIRSA:24010071 see, \url{https://scivideos.org/pirsa/24010071}}
          }

Aretaios Lalakos Northwestern University

DOI 10.48660/24010071
Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Spinning supermassive black holes (BHs) in active galactic nuclei (AGN) can launch relativistic collimated outflows, or jets, by coiling up the magnetic field lines that cross the event horizon on the scale of BH gravitational radius, Rg. Sustained jet launching and propagation to kpc-scales are thought to require non-zero angular momentum to form an accretion disk, keep the magnetic field lines on the BH, and ensure stable jet propagation. Past 3D general relativistic magnetohydrodynamic (GRMHD) work predicted that absent gas angular momentum, magnetized jets are expected to become unstable to the kink instability already at 800 Rg, i.e., orders of magnitudes smaller distances than the BH sphere of influence, or the Bondi radius, RB (e.g., for Sgr A* and M87, RB~10^[5-6] Rg). This raises the question: Do the jets need gas angular momentum to survive the kink instability and make it out to large distances, outside of Rb? I will present 3D GRMHD simulation results for a rapidly spinning BH immersed into uniform zero angular momentum gas threaded by a weak vertical magnetic field, with the largest simulated Bondi radius to date, RB = 1000 Rg. I will show that the BH accumulates dynamically-important magnetic field, enters the magnetically-arrested disk state, and produces powerful jets that make it out of Rb. I will also show how the jets get twisted into knots and dissipate their energy after the MAD state ends.

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Zoom link https://pitp.zoom.us/j/99925612004?pwd=QkhIUmpKRkVKUURpclhPekJST2NIQT09