Figure 15

Figure 15: Time-average mass accretion rate ˙m = M ˙c2∕LEdd as a function of the energy gap Δ Φ for models with a = 0 (circles), a∕M = 0.9 (squares), and a∕M = − 0.9 (triangles). The bars show the variability of ˙m. The lines represent the predicted dependencies γg∕(γg−1) m˙ ∝ (Δ Φ ), where γg = 4∕3 is the adiabatic index. Image reproduced by permission from [137], copyright by RAS.