Published online by Cambridge University Press: 04 August 2017
It is observed that a number of large-scale supersonic bipolar flows exist in star forming regions. Infrared sources which seem to excite active motions are usually found in the center of these objects (cf. the recent surveys by Bally and Lada 1983, Torrelles et al. 1983, Snell et al. 1984, Goldsmith et al. 1984). From the observation of the high density gas, the bipolar flow seems to originate from the interaction of the isotropic stellar wind with a large scale flattened interstellar cloud from which the protostars are formed.