Ab Initio Horizon-Scale Simulations of Magnetically Arrested Accretion in Sagittarius A* Fed by Stellar Winds

Abstract

We present 3D general relativistic magnetohydrodynamic (GRMHD) simulations of the accretion flow surrounding Sagittarius A* that are initialized using larger-scale MHD simulations of the $\sim$ 30 Wolf--Rayet (WR) stellar winds in the Galactic center. The properties of the resulting accretion flow on horizon scales are set not by ad hoc initial conditions but by the observationally constrained properties of the WR winds with limited free parameters. For this initial study we assume a non-spinning black hole. Our simulations naturally produce a $\sim 10^{-8}{M}_{\odot }$ yr${}^{-1}$ accretion rate, consistent with previous phenomenological estimates. We find that a magnetically arrested flow is formed by the continuous accretion of coherent magnetic field being fed from large radii. Near the event horizon, the magnetic field is so strong that it tilts the gas with respect to the initial angular momentum and concentrates the originally quasi-spherical flow to a narrow disk-like structure. We also present 230 GHz images calculated from our simulations where the inclination angle and physical accretion rate are not free parameters but are determined by the properties of the WR stellar winds. The image morphology is highly time variable. Linear polarization on horizon scales is coherent with weak internal Faraday rotation.

Accepted by ApJL. 14 pages, 8 figures. Animations available at https://smressle.bitbucket.io/animations.html

References in corpus (20)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• An Update on Monitoring Stellar Orbits in the Galactic Center
• An Unambiguous Detection of Faraday Rotation in Sagittarius A*
• Stellar and wind properties of massive stars in the central parsec of the Galaxy
• Galactic Centre stellar winds and Sgr A* accretion
• Observational appearance of inefficient accretion flows and jets in 3D GRMHD simulations: Application to Sgr~A*
• The Disc-Jet Symbiosis Emerges: Modeling the Emission of Sagittarius A* with Electron Thermodynamics
• Plasma diagnostic potential of 2p4f in N${}^{+}$ -- accurate wavelengths and oscillator strengths
• The Power of Imaging: Constraining the Plasma Properties of GRMHD Simulations using EHT Observations of Sgr A*
• Variable accretion and emission from the stellar winds in the Galactic centre
• Electron and proton heating in trans-relativistic magnetic reconnection
• The Surprisingly Small Impact of Magnetic Fields On The Inner Accretion Flow of Sagittarius A* Fueled By Stellar Winds
• Accretion of cool stellar winds on Sgr A*: another puzzle of the Galactic Centre?
• A Resolution Study of Magnetically Arrested Disks
• Tilted Disks around Black Holes: A Numerical Parameter Survey for Spin and Inclination Angle
• Stellar winds pump the heart of the Milky Way
• On the Comparison of AGN with GRMHD Simulations: I. Sgr A*

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• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
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• Black hole flares: ejection of accreted magnetic flux through 3D plasmoid-mediated reconnection
• Jets in Magnetically Arrested Hot Accretion Flows: Geometry, Power and Black Hole Spindown
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• Polarimetry and Astrometry of NIR Flares as Event Horizon Scale, Dynamical Probes for the Mass of Sgr A*
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• Spectral and Imaging properties of Sgr A* from High-Resolution 3D GRMHD Simulations with Radiative Cooling
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• Reconnection-driven flares in 3D black hole magnetospheres -- A scenario for hot spots around Sagittarius A*
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• Magnetized Accretion onto and Feedback from Supermassive Black Holes in Elliptical Galaxies
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• Magnetic Flux Transport in Radiatively Inefficient Accretion Flows and the Pathway towards a Magnetically Arrested Disk
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• The Effects of Gas Angular Momentum on the Formation of Magnetically Arrested Disks and the Launching of Powerful Jets
• Accretion Flow Morphology in Numerical Simulations of Black Holes from the ngEHT Model Library: The Impact of Radiation Physics
• A "coronal-mass-ejection'' model for flares in Sagittarius A*
• Magnetic Reconnection in Black-Hole Magnetospheres: Lepton Loading into Jets, Superluminal Radio Blobs, and Multi-wavelength Flares
• Flares and their echoes can help distinguish photon rings from black holes with space-Earth very long baseline interferometry
• H-AMR FORGE'd in FIRE I: Magnetic state transitions, jet launching and radiative emission in super-Eddington, highly magnetized quasar disks formed from cosmological initial conditions
• Implications from the velocity profile of the M87 jet: a possibility of a slowly rotating black hole magnetosphere
• General relativistic effects and the near-infrared and X-ray variability of Sgr A* I
• Detectability of Wandering Intermediate-Mass Black Holes in the Milky Way Galaxy from Radio to X-rays
• The Relationship Between Simulated Sub-Millimeter and Near-Infrared Images of Sagittarius A* from a Magnetically Arrested Black Hole Accretion Flow
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• Electron and proton energization in 3D reconnecting current sheets in semirelativistic plasma with guide magnetic field
• High-energy Gamma-rays from Magnetically Arrested Disks in Nearby Radio Galaxies
• The Effects of Tilt on the Time Variability of Millimeter and Infrared Emission from Sagittarius A*
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• Diverse Polarimetric Features of AGN Jets from Various Viewing Angles: Towards a Unified View
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• Compact stellar systems hosting an intermediate mass black hole: magnetohydrodynamic study of inflow-outflow dynamics
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre
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• Bridging Bondi and Event Horizon Scales: 3D GRMHD Simulations Reveal X-Shaped Radio Galaxy Morphology
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