This poster summarizes numerical collapse calculations of non-rotating and rotating singular, isothermal toroids that employed the zeus2d (Norman and Stone 1992) magnetohydrodynamics package. In the non-rotating collapse calculations, it is seen that infall proceeds at a constant rate and magnetically supported, high density pseudo-disks form in the equatorial plane. With rotating clouds, however, toroidal magnetic fields grow as infall proceeds, teaming with angular momentum to slow the inflow to the center and generate outflow.

• ZHI- YUN LI(Department of Astronomy, University of Virginia Charlottesville)
• FRANK SHU(Department of Astronomy, University of California Berkeley)
• ANTHONY ALLEN(Academia Sinica Institute of Astronomy and Astrophysics)