Stationary Accretion Disks Launching Super-fast-magnetosonic Magnetohydrodynamic Jets

We present self-similar models of resistive viscous Keplerian disks driving nonrelativistic MHD jets and becoming super-fast-magnetosonic. We show that in order to obtain such solutions, the thermal pressure must be a sizeable fraction of the poloidal magnetic pressure at the Alfvén surface. These steady solutions that undergo a recollimation shock causally disconnected from the driving engine account for structures with a high-temperature plasma in the sub-Alfvénic region. We suggest that only unsteady outflows with typical timescales of several disk dynamical timescales can be produced if the suitable pressure conditions are not fulfilled.