Resistive Magnetohydrodynamics of Jet Formation and Magnetically Driven   Accretion
  We carried out 2.5-dimensional resistive magnetohydrodynamic simulations to study the effects of magnetic diffusivity on magnetically driven mass accretion and jet formation. We found that (1) when the normalized magnetic diffusivity, is small, mass accretion and jet formation take place intermittently; (2) when diffusivity is middle, the system evolves toward a quasi-steady state; and the system evolves toward a quasi-steady state; and (3) when diffusivity is large, the accretion/mass outflow rate decreases with diffusivity and approaches 0. The results of these simulations indicate magnetic braking provide a mass accretion rate which is sufficient to explain the activity of AGNs. 
T. Kuwabara (1), K. Shibata (2), R. Matsumoto (1) ((1) Chiba Univ.,   (2) Kyoto Univ.)