Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..257r&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
Scientific paper
Great advance has been made during the last decade in the understanding of the collimated outflow phenomena characteristically found in association with young stars, in particular in what refers to its large scale (tenths of pc or more) manifestations. These manifestations include the Herbig-Haro objects, the optical and near-infrared jets, and the molecular bipolar outflows. Our understanding of the ``engine'' that powers these outflows is, however, still limited. There is some consensus in the sense that the acceleration and collimation of these winds involves magnetohydrodynamic processes in an accretion disk, but observations with very high angular resolution are needed to test the models. At present, one of the best available techniques to study outflows with the required high angular resolution is the observation in the centimeter radio continuum of thermal jets using sensitive interferometers. In this review, I discuss recent examples of results obtained with this technique. I also present new results and emphasize the promise of VLBI studies of masers that may trace outflows very close to the exciting star.
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