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• W3128663399 abstract "Considering a Schwarzschild black hole surrounded by a fully ionized hydrogen plasma, we study the refractive effect and the pure gravitational effect of the plasma on the shadow. The effects are treated in a unified formalism but characterized by two different parameters. For semi-realistic values of parameters, we find their corrections to the shadow radius are both negligible, and the gravitational correction can overtake the refractive correction for active galactic nuclei of masses larger than $10^9M_{odot}$. Since the refractive effect is induced by the electromagnetic interaction, this result is in sharp contrast to the textbook knowledge that the ratio of the gravitational force to the electromagnetic force is $Gm_em_p/e^2=4.4times10^{-40}$ in a hydrogen atom. With unrealistically large values of parameters, we illustrate the two effects on the light trajectories and the intensity map." @default.
• W3128663399 created "2021-02-15" @default.
• W3128663399 creator A5069524460 @default.
• W3128663399 creator A5069771802 @default.
• W3128663399 date "2021-02-01" @default.
• W3128663399 modified "2023-09-26" @default.
• W3128663399 title "Gravitational effect of a plasma on the shadow of Schwarzschild black holes." @default.
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• W3128663399 hasPublicationYear "2021" @default.
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