https://doi.org/10.1140/epjc/s10052-021-09959-z
Regular Article - Theoretical Physics
Gravitational effect of plasma particles on the shadow of Schwarzschild black holes
Department of Physics, East China Normal University, 200241, Shanghai, China
Received:
4
October
2021
Accepted:
19
December
2021
Published online:
3
January
2022
Considering a Schwarzschild black hole surrounded by a fully ionized hydrogen plasma, we study the effect of the gravitational field of the plasma particles on the shadow. We take a formalism in which this effect is unified with the refractive effect of the plasma medium studied previously, but the two effects are characterized by two independent 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 
. With unrealistically large values of parameters, we illustrate the two effects on the light trajectories and the intensity map.
© The Author(s) 2022
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