Black hole outflows initiated by a large-scale magnetic field
arXiv:2403.14882 · doi:10.1051/0004-6361/202349134
Abstract
Accreting black hole sources show variable outflows at different mass scales. For instance, in the case of galactic nuclei, our own galactic center Sgr A* exhibits flares and outbursts in the X-ray and infrared bands. Recent studies suggest that the inner magnetospheres of these sources have a pronounced effect on such emissions. Accreting plasma carries the frozen-in magnetic flux along with it down to the black hole horizon. During the in-fall, the magnetic field intensifies and it can lead to a magnetically arrested state. We investigate the competing effects of inflows at the black hole horizon and the outflows developed in the accreting plasma due to the action of magnetic field in the inner magnetosphere and their implications. We start with a spherically symmetric Bondi-type inflow and introduce the magnetic field. In order to understand the influence of the initial configuration, we start the computations with an aligned magnetic field with respect to the black hole rotation axis. Then we proceed to the case of magnetic fields inclined to the black hole rotation axis. We employ the 2D and 3D versions of HARM code for the aligned field models while using the 3D version for the inclined field and compare the results of computations against each other. We observe how the magnetic lines of force start accreting with the plasma while an equatorial intermittent outflow develops and goes on pushing some material away from the black hole partially along the equatorial plane, and partly ejecting it out of the plane in the vertical direction. In consequence, the accretion rate also fluctuates. The black hole spin direction prevails at later stages and it determines the flow geometry near the event horizon, whereas on larger scales the flow geometry stays influenced by the initial inclination of the field.
Submitted to Astronomy & Astrophysics
References in corpus (16)
- First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
- Black hole flares: ejection of accreted magnetic flux through 3D plasmoid-mediated reconnection
- "Meissner effect" and Blandford-Znajek mechanism in conductive black hole magnetospheres
- An overview of jets and outflows in stellar mass black holes
- Radiative reconnection-powered TeV flares from the black hole magnetosphere in M87
- Magnetically Modified Spherical Accretion in GRMHD: Reconnection-Driven Convection and Jet Propagation
- Images of magnetospheric reconnection-powered radiation around supermassive black holes
- Spinning black holes magnetically connected to a Keplerian disk -- Magnetosphere, reconnection sheet, particle acceleration and coronal heating
- GRRMHD Simulations of MAD Accretion Disks Declining from Super-Eddington to Sub-Eddington Accretion Rates
- Two-way coupling of magnetohydrodynamic simulations with embedded particle-in-cell simulations
- Test of the Formation mechanism of the Broad Line Region in Active Galactic Nuclei
- Reconnection-driven flares in 3D black hole magnetospheres -- A scenario for hot spots around Sagittarius A*
- The Effects of Gas Angular Momentum on the Formation of Magnetically Arrested Disks and the Launching of Powerful Jets
- Massive Black Holes: formation and evolution
- Can MAD accretion disks launching structured jets explain both GRB and AGN engines? Magnetically arrested accretion disks launching structured jets in application to GRB and AGN engines
- Accretion induced black hole spin up revised by numerical GR MHD simulations