SPECTROSCOPIC SIGNATURES OF INFALL IN YOUNG PROTOSTELLAR SYSTEMS

We present the first radiative transfer calculations of millimeter and submillimeter molecular line emission from 'self-consistent' models o f nonspherical, collapsing, rotating protostellar systems. We find tha t: (1) the morphology of the gas and dust emission is a strong functio n of collapse time and angular resolution, (2) centroid velocity maps can provide a distinct infall signature, and (3) the unambiguous detec tion of infall toward binary systems becomes more difficult with incre asing binary separation.