Shadows of rotating Einstein-Maxwell-dilaton black holes surrounded by a plasma

Abstract

We consider rotating charged black holes with a scalar dilaton field and surrounded by plasma, with the purpose of studying their shadows. The corresponding metric has been previously obtained in the literature from the static solution by using the Newman-Janis algorithm. Assuming a well known form for the pressureless and nonmagnetized plasma distribution, which is suitable for the separation of the Hamilton-Jacobi equation for light, we derive an expression that determines the shape of the shadow. We present some examples of contours and we analyze their observable properties as functions of the charge and the dilaton coupling. We find that the presence of plasma introduces a dependency on the frequency, with the shadow becoming smaller as the frequency decreases.

14 pages, 5 figures; v2: improved and extended version, new references added

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Cited by in corpus (15)

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• Shadows and photon rings of a spherically accreting Kehagias-Sfetsos black hole
• Thin accretion disk and shadow of Kerr-Sen black hole in Einstein-Maxwell-dilaton-axion gravity
• Twisting shadows: Light rings, lensing and shadows of black holes in swirling universes
• Time delay induced by plasma in strong lens systems
• Remarks on the light ring images and the optical appearance of hairy black holes in Einstein-Maxwell-dilaton gravity
• Trajectories of photons around a rotating black hole with unusual asymptotics
• Deflection of light rays in a moving medium around a spherically symmetric gravitating object
• Optical effects in unmagnetized cold plasmas by a chiral axion factor
• Deciphering signatures of Kerr-Sen black holes in presence of plasma from the Event Horizon Telescope data
• Shadows cast by a class of rotating black bounces with an anisotropic fluid
• Investigating the interplay of the braneworld gravity and the plasma environment on the black hole shadow
• Light deflection in axially symmetric stationary spacetimes filled with a moving medium
• Exact Dynamical Black Hole Solutions in Five or Higher Dimensions