Radiative Models of Sagittarius A* and M87 from Relativistic MHD Simulations

Abstract

Ongoing millimeter VLBI observations with the Event Horizon Telescope allow unprecedented study of the innermost portion of black hole accretion flows. Interpreting the observations requires relativistic, time-dependent physical modeling. We discuss the comparison of radiative transfer calculations from general relativistic MHD simulations of Sagittarius A* and M87 with current and future mm-VLBI observations. This comparison allows estimates of the viewing geometry and physical conditions of the Sgr A* accretion flow. The viewing geometry for M87 is already constrained from observations of its large-scale jet, but, unlike Sgr A*, there is no consensus for its millimeter emission geometry or electron population. Despite this uncertainty, as long as the emission region is compact, robust predictions for the size of its jet launching region can be made. For both sources, the black hole shadow may be detected with future observations including ALMA and/or the LMT, which would constitute the first direct evidence for a black hole event horizon.

8 pages, 2 figures, submitted to the proceedings of AHAR 2011: The Central Kiloparsec

References in corpus (16)

• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic Simulations
• Global General Relativistic MHD Simulation of a Tilted Black-Hole Accretion Disk
• An Unambiguous Detection of Faraday Rotation in Sagittarius A*
• The Submillimeter Bump in Sgr A* from Relativistic MHD Simulations
• 1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scales
• Evidence for Low Black Hole Spin and Physically Motivated Accretion Models from Millimeter VLBI Observations of Sagittarius A*
• Simulating the Emission and Outflows from Accretion Disks
• WHAM: A WENO-based general relativistic numerical scheme I: Hydrodynamics
• General Relativistic Force-Free Electrodynamics: A New Code and Applications to Black Hole Magnetospheres
• Pair Production in Low Luminosity Galactic Nuclei
• Parsec-scale Faraday Rotation Measures from General Relativistic MHD Simulations of Active Galactic Nuclei Jets
• Observational Signatures of Tilted Black Hole Accretion Disks from Simulations
• Epicyclic Motions and Standing Shocks in Numerically Simulated Tilted Black-Hole Accretion Disks
• The Mid-Infrared Emission of M87
• GRMHD prediction of coronal variability in accreting black holes

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• General relativistic magnetohydrodynamical $\kappa$-jet models for Sgr A*
• Particle Acceleration and the Origin of X-ray Flares in GRMHD simulations of Sgr A*
• The Event Horizon Telescope: exploring strong gravity and accretion physics
• Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk
• The Properties of Reconnection Current Sheets in GRMHD Simulations of Radiatively Inefficient Accretion Flows
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