Full-transport radiation GRMHD simulations show super-Eddington black hole accretion is geometrically thick, drives strong outflows, and radiates with very low efficiency (below about 0.5% at 150 times Eddington).
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Machine learning on simulated images identifies that flux eruption events cause more diffuse, polarized, lower-flux millimeter emission with decreased Q-U loop rotation rate, achieving ~80% accuracy with random forests on summary statistics.
Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.
Large-scale magnetic polarity inversions in a SANE accretion flow, with non-thermal electrons, can reproduce Sgr A* near-infrared flares and the frequency-dependent radio time delays caused by plasma self-absorption.
Reconnection-powered inverse Compton emission with beaming along the upstream magnetic field can reproduce the flux and variability of M87*'s strongest very high energy flares.
JWST NIRCam infrared monitoring of Sgr A* finds fully continuous variability on seconds-to-year timescales, a faint/bright two-population flux distribution, and a 3-40 second lag of 4.8 micron behind 2.1 micron emission.
Sgr A*'s near-infrared spectral index is constant at α = −0.50 ± 0.08 ± 0.17 from 1 to 40 mJy, ruling out the synchrotron-cutoff-shift model of its variability.
A multiyear ALMA survey of 39 AGN and Sgr A* finds the Faraday rotation measure increases with frequency from 93 to 343 GHz, supporting magnetized jet sheaths while leaving accretion-flow screens possible.
In strongly magnetized proton-electron plasmas, 3D reconnection becomes less efficient at dissipating magnetic energy than 2D reconnection, opposite to the usual rule.
An inner magnetically arrested disk can form self-consistently in an advection-dominated accretion flow when the external magnetic field is strong, boosting jet power by about two orders of magnitude.
A new public GRMHD simulation library of MAD and SANE accretion flows across five black hole spins confirms SANE spin equilibrium near a*~0.94 and MAD jet-powered spin-down.
Adding separate electron thermodynamics and radiative cooling to magnetically arrested disk simulations of Sgr A* lowers predicted 230 GHz variability by nearly 50%, but still leaves it above observed levels.
Simulations of accreting black holes in standard and complex spacetimes indicate that magnetic geometry, quantum corrections, and binary dynamics influence flares, precession, photon rings, and multi-wavelength variability, with potential EHT constraints.
citing papers explorer
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Identifying Observational Signatures of Flux Eruption Events in Supermassive Black Hole Accretion Flows with Machine Learning
Machine learning on simulated images identifies that flux eruption events cause more diffuse, polarized, lower-flux millimeter emission with decreased Q-U loop rotation rate, achieving ~80% accuracy with random forests on summary statistics.
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When the Shadow Meets Its Measure: Assessing the Feasibility of Submillimeter Black Hole Shadow Imaging in Megamaser Disk AGN
Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.
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VAPOLA - A multiyear, multiband polarization survey of AGNs and Sgr A* at millimeter wavelengths with ALMA II. Spectropolarimetric properties and their evolution from 2017 to 2023
A multiyear ALMA survey of 39 AGN and Sgr A* finds the Faraday rotation measure increases with frequency from 93 to 343 GHz, supporting magnetized jet sheaths while leaving accretion-flow screens possible.
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GRMHD and GRRT Simulations of Black Hole Accretion: Flares, Precession, and Complex Spacetimes
Simulations of accreting black holes in standard and complex spacetimes indicate that magnetic geometry, quantum corrections, and binary dynamics influence flares, precession, photon rings, and multi-wavelength variability, with potential EHT constraints.