Semi-analytic studies of accretion disk and magnetic field geometry in M87*

Abstract

Context: Magnetic fields play a pivotal role in dynamics of black hole accretion flows and formation of relativistic jets. Observations by the Event Horizon Telescope (EHT) provided unprecedented insights into accretion structures near black holes. Interpreting these observations requires a theoretical framework linking polarized emission to underlying system properties and magnetic field geometries. Aims: We investigate how system properties, particularly magnetic field geometry in the event horizon scale region, influence the structure of the observable synchrotron emission in M87*. Specifically, we aim to quantify the sensitivity of observables used by the EHT to black hole spin, plasma dynamics, accretion disk thickness, and magnetic field geometry. Methods: We adopt a semi-analytic radiatively inefficient accretion flow model in Kerr spacetime. We vary magnetic field geometry, black hole spin, accretion disk dynamics, and geometric thickness of the disk. We perform general relativistic ray tracing with a full polarized radiative transfer to obtain synthetic images of M87*. We extract EHT observables, such as disk diameter, asymmetry, and polarimetric metrics from synthetic models. We also consider a number of general relativistic magnetohydrodynamics simulations and compare them with the semi-analytical models. Results: We see limited impact of the disk thickness on observables. On the other hand, toroidal field dominated and poloidal field dominated magnetic configurations can be distinguished reliably. The flow dynamics, in particular presence of radial inflow, also significantly impacts the EHT observables. Conclusions: The M87* system is most consistent with a poloidal magnetic field dominated flow with partially radial inflow. While the spin remain elusive, moderate or large positive values are preferred.

arXiv comment12 pages and 8 figures

References in corpus (68)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Observational Evidence of AGN Feedback
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
• Hot Accretion Flows Around Black Holes
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Efficient Generation of Jets from Magnetically Arrested Accretion on a Rapidly Spinning Black Hole
• First M87 Event Horizon Telescope Results. II. Array and Instrumentation
• Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
• General Relativistic Magnetohydrodynamic Simulations of Magnetically Choked Accretion Flows around Black Holes
• First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
• HARM: A Numerical Scheme for General Relativistic Magnetohydrodynamics
• Magnetically Arrested Disk: An Energetically Efficient Accretion Flow
• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• Black Hole Shadows, Photon Rings, and Lensing Rings
• A Measurement of the Electromagnetic Luminosity of a Kerr Black Hole
• Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei
• GRMHD Simulations of Magnetized Advection Dominated Accretion on a Non-Spinning Black Hole: Role of Outflows
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• The Black-Hole Mass in M87 from Gemini/NIFS Adaptive Optics Observations
• First Sagittarius A* Event Horizon Telescope Results. III: Imaging of the Galactic Center Supermassive Black Hole
• Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic Simulations
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• Universal Interferometric Signatures of a Black Hole's Photon Ring
• The Structure and Dynamics of the Sub-parsec Scale Jet in M87 Based on 50 VLBA Observations Over 17 Years at 43 GHz
• The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
• Numerical simulations of super-critical black hole accretion flows in general relativity
• General relativistic magnetohydrodynamical simulations of the jet in M87
• The Current Ability to Test Theories of Gravity with Black Hole Shadows
• The Influence of Magnetic Field Geometry on the Evolution of Black Hole Accretion Flows: Similar Disks, Drastically Different Jets
• Black hole flares: ejection of accreted magnetic flux through 3D plasmoid-mediated reconnection
• Electrodynamics of black hole magnetospheres
• Kinematics of the jet in M87 on scales of 100 -- 1000 Schwarzschild radii
• High Resolution Linear Polarimetric Imaging for the Event Horizon Telescope
• Magnetically Arrested Disks and Origin of Poynting Jets: Numerical Study
• Constraining the Accretion Rate Onto Sagittarius A* Using Linear Polarization
• Evidence for Low Black Hole Spin and Physically Motivated Accretion Models from Millimeter VLBI Observations of Sagittarius A*
• Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
• Can the EHT M87 results be used to test general relativity?
• Polarimetric properties of Event Horizon Telescope targets from ALMA
• Geometric modeling of M87* as a Kerr black hole or a non-Kerr compact object
• Images and photon ring signatures of thick disks around black holes
• Modeling Seven Years of Event Horizon Telescope Observations with Radiatively Inefficient Accretion Flow Models
• Photon rings of spherically symmetric black holes and robust tests of non-Kerr metrics
• First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization
• Observational signatures of disk and jet misalignment in images of accreting black holes
• The Polarized Image of a Synchrotron Emitting Ring of Gas Orbiting a Black Hole
• Polarized Synchrotron Emissivities and Absorptivities for Relativistic Thermal, Power-Law, and Kappa Distribution Functions
• Probing the magnetic field structure in Sgr A* on Black Hole Horizon Scales with Polarized Radiative Transfer Simulations
• Discriminating Accretion States via Rotational Symmetry in Simulated Polarimetric Images of M87
• Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope
• Charged particle dynamics in parabolic magnetosphere around Schwarzschild black hole
• Photon ring test of the Kerr hypothesis: Variation in the ring shape
• The Effects of Accretion Flow Dynamics on the Black Hole Shadow of Sagittarius A${}^{\ast }$
• Probing the innermost accretion flow geometry of Sgr A* with Event Horizon Telescope
• Spacetime Tomography Using The Event Horizon Telescope
• Polarimetric signatures of hot spots in black hole accretion flows
• Unraveling Twisty Linear Polarization Morphologies in Black Hole Images
• The internal Faraday screen of Sagittarius A*
• Horizon-scale variability of M87* from 2017--2021 EHT observations
• Constraining the size of the dark region around the M87 black hole by space-VLBI observations
• Multi-wavelength torus-jet model for Sgr~A*
• Black hole in a combined magnetic field: ionized accretion disks in the jetlike and looplike configurations
• Gravity versus astrophysics in black hole images and photon rings: Equatorial emissions and spherically symmetric space-times
• Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations