Black Hole Shadow Image and Visibility Analysis of Sagittarius A*

Abstract

The compact dark objects with very large masses residing at the centres of galaxies are believed to be black holes. Due to the gravitational lensing effect, they would cast a shadow larger than their horizon size over the background, whose shape and size can be calculated. For the supermassive black hole candidate Sgr A*, this shadow spans an angular size of about 50 micro arc second, which is under the resolution attainable with the current astronomical instruments. Such a shadow image of Sgr A* will be observable at about 1 mm wavelength, considering the scatter broadening by the interstellar medium. By simulating the black hole shadow image of Sgr A* with the radiatively inefficient accretion flow model, we demonstrate that analyzing the properties of the visibility function can help us determine some parameters of the black hole configuration, which is instructive to the sub-millimeter VLBI observations of Sgr A* in the near future.

11 pages, 18 figures (.eps), MNRAS accepted

References in corpus (14)

• Advection-Dominated Accretion: A Self-Similar Solution
• Viewing the Shadow of the Black Hole at the Galactic Center
• Stellar Orbits Around the Galactic Center Black Hole
• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• The Supermassive Black Hole at the Galactic Center
• Stellar dynamics in the central arcsecond of our galaxy
• Shapes and Positions of Black Hole Shadows in Accretion Disks and Spin Parameters of Black Holes
• A size of ~1 AU for the radio source Sgr A* at the centre of the Milky Way
• Imaging Optically-Thin Hot Spots Near the Black Hole Horizon of Sgr A* at Radio and Near-Infrared Wavelengths
• Dynamical Constraints On Alternatives To Massive Black Holes In Galactic Nuclei
• Detection of the Intrinsic Size of Sagittarius A* through Closure Amplitude Imaging (includes Online Supporting Material)
• A Model for High Frequency Quasi-periodic Oscillations from Accreting Black Holes
• Light Curves from an MHD Simulation of a Black Hole Accretion Disk
• Diffraction Limited Imaging Spectroscopy of the SgrA* Region using OSIRIS, a new Keck Instrument

Cited by in corpus (51)

• Hot Accretion Flows Around Black Holes
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• Photon Regions and Shadows of Kerr-Newman-NUT Black Holes with a Cosmological Constant
• Influence of a plasma on the shadow of a spherically symmetric black hole
• Gravitational Lensing by Black Holes
• A new method for shadow calculations: application to parameterised axisymmetric black holes
• Radiative Models of Sgr A* from GRMHD Simulations
• Shadows of spherically symmetric black holes and naked singularities
• Measuring the Spins of Accreting Black Holes
• Shadow cast and Deflection angle of Kerr-Newman-Kasuya spacetime
• Black Hole Based Tests of General Relativity
• The Spin of Supermassive Black Holes
• Evidence for Low Black Hole Spin and Physically Motivated Accretion Models from Millimeter VLBI Observations of Sagittarius A*
• Photon Regions and Shadows of Accelerated Black Holes
• Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI
• Estimating the Parameters of Sgr A*'s Accretion Flow Via Millimeter VLBI
• Towards the event horizon -- the supermassive black hole in the Galactic Center
• Testing Generalized Einstein-Cartan-Kibble-Sciama Gravity using Weak Deflection Angle and Shadow Cast
• Shadow cast of non-commutative black holes in Rastall gravity
• Analysis of the Yukawa gravitational potential in $f(R)$ gravity II: relativistic periastron advance
• Jet-lag in Sgr A*: What size and timing measurements tell us about the central black hole in the Milky Way
• Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk
• Photon ring structure of rotating regular black holes and no-horizon spacetimes
• Absorption of planar massless scalar waves by Bardeen regular black holes
• Multiwavelength VLBI observations of Sagittarius A*
• Scattering by regular black holes: Planar massless scalar waves impinging upon a Bardeen black hole
• Modeling mm- to X-ray flare emission from SgrA*
• Observational predictions of LQG motivated polymerized black holes and constraints from Sgr A* and M87*
• Images of the radiatively inefficient accretion flow surrounding a Kerr black hole: application in Sgr A*
• Silhouettes of invisible black holes
• Testing the Accretion Flow with Plasma Wave Heating Mechanism for Sagittarius a* by the 1.3MM Vlbi Measurements
• Modelling the black hole silhouette in Sgr A* with ion tori
• Absorption by dirty black holes: null geodesics and scalar waves
• Polarized Emission of Sagittarius A*
• Bayesian techniques for comparing time-dependent GRMHD simulations to variable Event Horizon Telescope observations
• Wisps in the Galactic center: NIR triggered observations of the radio source Sgr A* at 43 GHz
• Testing Vector Gravity with Gravitational Wave Interferometers
• Vector theory of gravity: Universe without black holes and solution of dark energy problem
• The variability of Sagittarius A* at 3 millimeter
• Linearly and Circularly Polarized Emission in Sagittarius A*
• Uniformly rotating, axisymmetric and triaxial quark stars in general relativity
• STU Black Holes and SgrA*
• Black Hole spin dependence of general relativistic multi-transonic accretion close to the horizon
• The Nature of Linearly Polarized Millimeter and Sub-millimeter Emission in Sagittarius A*
• Confronting the jet model of Sgr A* with the Faraday rotation measure observations
• Anisotropic radiation field and trapped photons around the Kerr black hole
• Direct time radio variability induced by non-axisymmetric standing accretion shock instability: implications for M87
• Oscillating axion bubbles as alternative to supermassive black holes at galactic centers
• Effect of matter geometry on low angular momentum black hole accretion in the Kerr metric
• The Galactic Center Black Hole Laboratory
• Visible shapes of black holes M87* and SgrA*