On the Comparison of AGN with GRMHD Simulations: I. Sgr A*

Abstract

We present models of Galactic Center emission in the vicinity of Sagittarius A* that use parametrizations of the electron temperature or energy density. These models include those inspired by two-temperature general relativistic magnetohydrodynamic (GRMHD) simulations as well as jet-motivated prescriptions generalizing equipartition of particle and magnetic energies. From these models, we calculate spectra and images and classify them according to their distinct observational features. Some models produce morphological and spectral features, e.g., image sizes, the sub-mm bump and low frequency spectral slope compatible with observations. Models with spectra consistent with observations produce the most compact images, with the most prominent, asymmetric photon rings. Limb brightened outflows are also visible in many models. Of all the models we consider, that which represents the current data the best is one in which electrons are relativistically hot when magnetic pressure is larger than the thermal pressure, but cold (i.e., negligibly contributing to the emission) otherwise. This work is part of a series also applying the "observing" simulations methodology to near-horizon regions of supermassive black holes in M87 and 3C 279.

arXiv comment16 pages, 14 figures

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Cited by in corpus (24)

• First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
• Flares in the Galactic center I: orbiting flux tubes in Magnetically Arrested Black Hole Accretion Disks
• Sgr A* near-infrared flares from reconnection events in a magnetically arrested disc
• Ab Initio Horizon-Scale Simulations of Magnetically Arrested Accretion in Sagittarius A* Fed by Stellar Winds
• Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
• Precessing jet nozzle connecting to a spinning black hole in M87
• A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating
• Comparison of the ion-to-electron temperature ratio prescription: GRMHD simulations with electron thermodynamics
• General relativistic MHD simulations of non-thermal flaring in Sagittarius A*
• Spectral and Imaging properties of Sgr A* from High-Resolution 3D GRMHD Simulations with Radiative Cooling
• Silhouettes of invisible black holes
• GRMHD Simulations and Modeling for Jet Formation and Acceleration Region in AGNs
• Microphysical Plasma Relations from Special-relativistic Turbulence
• Temperature properties in magnetised and radiatively cooled two-temperature accretion flows onto a black hole
• Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87* and Sgr A*
• Probing spacetime and accretion model for the Galactic Center: Comparison of Kerr and dilaton black hole shadows
• Determining the Composition of Relativistic Jets from Polarization Maps
• Relative depolarization of the black hole photon ring in GRMHD models of Sgr A* and M87*
• Polarization images of accretion flow around supermassive black holes: imprints of toroidal field structure
• Magnetic field structure in the vicinity of a super-massive black hole in low luminosity galaxies: the case of Sgr A*
• Deep learning inference with the Event Horizon Telescope II. The Zingularity framework for Bayesian artificial neural networks
• New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared
• Visible shapes of black holes M87* and SgrA*
• PATOKA: Simulating Electromagnetic Observables of Black Hole Accretion