Abstract:
We discuss the shadow cast by the charged Reissner-Nordstr¨om (RN) AdS
black hole. With the help of Killing equation and Hamilton-Jacobi equation, we calculate
the geodesic equations for null particle. With the help of geodesics of null particle, we then
determine the celestial coordinates (α, β) and the shadow radius of the RN AdS black
hole. We present a graphical analysis of the black hole shadow and find that shadow is
a perfectly dark circle. The impacts of charge and cosmological constant of the RN AdS
black hole on the radius of shadow are also presented. In this connection, radius of the
shadow is a decreasing function of the charge. Furthermore, we study the effects of plasma
medium on the RN AdS black hole shadow. Here, we find that radius of circular shadow
increases with increasing plasma parameter. In addition, we also discuss the energy
emission rate of RN AdS black hole. The effects of parameters like charge, cosmological
constant and plasma parameter on energy emission rate are analyzed graphically.
