MOLECULAR CLOUD CORE AND CS OUTFLOW ASSOCIATED WITH HARO 4-255 FIR

The region containing the two young stellar objects, Haro 4-255 and Ha ro 4-255 FIR, has been studied through single-dish and aperture-synthe sis CS (1-0) observations. We have detected an intense CS outflow, who se FWZI velocity extent is about 9 km s-1, in the single-dish observat ions. The distribution of the blue CS lobe is appreciably different fr om that of the blue CO lobe, whereas the distribution of the red CS lo be is similar to that of the red CO lobe. The CS abundance in this out flow seems to be enhanced nearly by one order of magnitude, although t hat in the quiescent gas shows a more normal value. The mass of the CS outflow is appreciably larger than that of the CO outflow, while the mechanical luminosity of the CS outflow is smaller than that of the CO outflow. The aperture-synthesis data show no counterpart to the CS ou tflow but contain two emission features which correspond to two local intensity maxima seen in the single-dish map. One of these features ex tends from Haro 4-255 to Haro 4-255 FIR: it might represent a density maximum in the molecular cloud core. The blueshifted emission of the C S outflow is less prominent, probably because it is impeded by the den sest portion of the core.