Publication date: Jan 2017
Abstract:
We study the shadow of the rotating black hole with quintessential
energy (i) in vacuum, (ii) in the presence of plasma with radial power-
law density. For the vacuum case, the quintessential field parameter of
the rotating black hole significantly changes the shape of the shadow.
With increasing quintessential field parameter, the radius of the shadow
also increases. With the increase of the radius of the shadow of the
rotating black hole, the quintessential field parameter causes decrease
of the distortion of the shadow shape: in the presence of the
quintessential field parameter, the shadow of the fast rotating black
hole becomes too close to the circle. We assume the distant observer of
the black hole shadow to be located near the so-called static radius
where the gravitational attraction of the black hole is just balanced by
the cosmic repulsion. The shape and size of the shadow of quintessential
rotating black hole surrounded by plasma depends on (i) plasma
parameters, (ii) black hole spin and (iii) quintessential field
parameter. With the increase of the plasma refraction index, the
apparent radius of the shadow increases. However, for the large values
of the quintessential field parameter, the change of the black hole
shadow shape due to the presence of plasma is not significant, i.e. the
effect of the quintessential field parameter dominates over the plasma
effect.
Authors:
Abdujabbarov, Ahmadjon; Toshmatov, Bobir; Stuchlík, Zdeněk; Ahmedov, Bobomurat;