Figure 14.

Relativistic wind accretion onto a rapidly-rotating Kerr black hole (a = 0.999 M, the black-hole spin is counterclockwise) in Kerr-Schild coordinates (left panel). Isocontours of the logarithm of the density are plotted at the final stationary time t = 500 M. Brighter colors (yellow-white) indicate high density regions, while darker colors (blue) correspond to low density zones. The right panel shows how the flow solution looks when transformed to Boyer-Lindquist coordinates. The shock appears here totally wrapped around the horizon of the black hole. The box is 12 M units long. The simulation employed a (r, ϕ)-grid of 200 × 160 zones. Further details are given in [135].