Shadows of Kerr black holes with a Gaussian-distributed plasma in the polar direction

Abstract

In this work, we study the shadow of Kerr black hole surrounded by an axisymmetric plasma, whose density takes a Gaussian distribution in the polar direction. Along the radial direction, we consider two models: in model A the density of the plasma decays in a power law; in model B the density obeys a logarithmic Gaussian distribution. Using the numerical backward ray-tracing method, we find that the size of the shadow is sensitive to the inclination angle of the observer due to the polar distribution of the density of the plasma. In particular, we pay special attention to the model B and investigate the influence of the radial position of maximum density, the decay rate of the density towards the event horizon and the opening angle of the plasma on the shape and size of the Kerr black hole shadow. The effects of the plasmas studied in this work can be qualitatively explained by taking the plasmas as convex lenses with the refractive index being less than $1$.

19 pages,13 figures

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• Gravitational Lensing in presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow
• QED Effect on Black Hole Shadow
• Gravitational lensing in a non-uniform plasma
• Particle acceleration around rotating Einstein-Born-Infeld black hole and plasma effect on gravitational lensing
• Axion-plasmon or magnetized plasma effect on an observable shadow and gravitational lensing of a Schwarzschild black hole
• Gravitational radiospectrometer
• Influence of a plasma on the observational signature of a high-spin Kerr black hole
• Shadow and weak gravitational lensing of a rotating regular black hole in a non-minimally coupled Einstein-Yang-Mills theory in the presence of plasma
• Analytical study of light ray trajectories in Kerr spacetime in the presence of an inhomogeneous anisotropic plasma
• Gravitational effect of plasma particles on the shadow of Schwarzschild black holes
• Light deflection by squashed Kaluza-Klein black holes in a plasma medium

Cited by in corpus (19)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Observational Appearances of Magnetically Charged Black Holes in Born-Infeld Electrodynamics
• Strong deflection limit analysis of black hole lensing in inhomogeneous plasma
• EHT observables as a tool to estimate parameters of supermassive black holes
• Shadows of rotating Einstein-Maxwell-dilaton black holes surrounded by a plasma
• Geodesic structure, shadow and optical appearance of black hole immersed in Chaplygin-like dark fluid
• How different are shadows of compact objects with and without horizons?
• Shadows and accretion disk images of charged rotating black hole in modified gravity theory
• Time delay induced by plasma in strong lens systems
• Influence of plasma on the optical appearance of spinning black hole in Kalb-Ramond gravity and its Existence around M87* and Sgr A*
• Optical Appearance and Shadow of Kalb-Ramond Black Hole: Effects of Plasma and Accretion Models
• Influence of Quantum Correction on Kerr Black Hole in Effective Loop Quantum Gravity via Shadows and EHT Results
• Investigating the shadows of new regular black holes with a Minkowski core: Effects of spherical accretion and core type differences
• Weak gravitational lensing by an ESTGB black hole in the presence of a plasma
• QED Effects on Kerr-Newman Black Hole Shadows
• Perturbative and numerical approach to plasma strong lensing
• Deflection of light rays in a moving medium around a spherically symmetric gravitating object
• Shadows cast by a class of rotating black bounces with an anisotropic fluid
• Light deflection in axially symmetric stationary spacetimes filled with a moving medium