Figure 11

Figure 11: Top panel: Luminosity vs accretion rate for three values of black hole spin (a∗ = a∕M = 0.0, 0.9, 0.999) and two values of α = 0.01 (black) and 0.1 (red line). Bottom panel: efficiency of accretion η = (L ∕LEdd )∕ (M ˙ ∕M˙Edd ) (here M˙Edd = 16LEdd∕c2). Image reproduced by permission from [269].