Shadow cast by a rotating black hole with anisotropic matter
  We obtain the shadow cast induced by the rotating black hole with an
anisotropic matter. A Killing tensor representing the hidden symmetry is
derived explicitly. The existence of separability structure implies a complete
integrability of the geodesic motion. We analyze an effective potential around
the unstable circular photon orbits to show that one side of the black hole is
brighter than the other side. Further, it is shown that the inclusion of the
anisotropic matter ($Kr^{2(1-w)}$) has an effect on the observables of the
shadow cast. The shadow observables include approximate shadow radius $R_s$,
distortion parameter $\delta_s$, area of the shadow $A_s$, and oblateness
$D_{os}$.
