2015 Seminar List:
A current belief in the massive star formation has been the development collimated, bipolr-like outflows before the presence of less collimated, wind-like outflows, in consideration of gas ejections associated with accretion disk and magnetic fields.
We present the first discovery of the transition of outflow from less collimated to collimated morphology based on a series of VLBI observations with H2O maser and continuum for almost two decades.
Physics underlying such a transition would be discussed. The observations strongly support very recent MHD simulations.