Testing the Accretion Flow with Plasma Wave Heating Mechanism for Sagittarius a* by the 1.3MM Vlbi Measurements

Abstract

The vicinity of the supermassive black hole associated with the compact radio source Sagittarius (Sgr) A* is believed to dominate the observed emission at wavelengths near and shorter than $\sim$ 1 millimeter. We show that a general relativistic accretion flow, heated via the plasma wave heating mechanism, is consistent with the polarization and recent mm-VLBI observations of Sgr A* for an inclination angle of $\sim 45^{\circ }$, position angle of $\sim 140^{\circ }$, and spin $\lesssim 0.9$. Structure in visibilities produced by the black hole shadow can potentially be observed by 1.3 mm-VLBI on the existing Hawaii-CARMA and Hawaii-SMT baselines. We also consider eight additional potential mm-VLBI stations, including sites in Chile and New Zealand, finding that with these the basic geometry of the emission region can be reliably estimated.

ApJ accepted; 21 pages, 8 figures

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Cited by in corpus (26)

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• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
• Photon Rings around Kerr and Kerr-like Black Holes
• Testing the No-Hair Theorem with Event Horizon Telescope Observations of Sagittarius A*
• 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*
• Sagittarius A* Accretion Flow and Black Hole Parameters from General Relativistic Dynamical and Polarized Radiative Modeling
• Sgr A* and General Relativity
• Superradiant evolution of the shadow and photon ring of Sgr A${}^{\star }$
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk
• Measuring Spin from Relative Photon Ring Sizes
• Constraining the Structure of Sagittarius A*'s Accretion Flow with Millimeter-VLBI Closure Phases
• The Circular Polarization of Sagittarius A* at Submillimeter Wavelengths
• Faraday Conversion and Rotation In Uniformly Magnetized Relativistic Plasmas
• Probing the innermost accretion flow geometry of Sgr A* with Event Horizon Telescope
• Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI
• EHT observables as a tool to estimate parameters of supermassive black holes
• Black hole Spin Measurement Based on Time-domain VLBI Observations of Infalling Gas Cloud
• An accretion-jet model for M87: interpreting the spectral energy distribution and Faraday rotation measure
• Near-infrared polarimetry as a tool for testing properties of accreting super-massive black holes
• Observational Testability of Kerr bound in X-ray Spectrum of Black-Hole Candidates
• Relativistic time delay analysis of pulsar signals near ultra-compact objects
• Constraining the Flaring Region of Sagittarius A* By 1.3mm VLBI Measurements
• Impact of the nonthermal electron radiation effects on the horizon scale image structure of Sagittarius A*