CORES AND CAVITIES IN NGC-1333

We present 1.3 mm continuum and CS J = 5 --> 4 maps at 12'' resolution of the NGC1333 star forming region. The area covered is 8' x 6'. The large-scale bolometer and CS maps delineate very nicely the large cent ral cavity together with the cores situated in the surrounding compres sed shell. In addition to the four dust cores IRAS4A-B, IRAS2 and SVS1 3, we discovered two fainter condensations, one of which is not associ ated with protostellar activity. All protostars are surrounded by exte nded low-emissivity envelopes and show indications of depletion of mol ecules onto grains. The continuum emission traces material entrained b y the outflows powered by IRAS4A, IRAS2 and SVS13. The CS J = 5 --> 4 is observed in all dust cores. Apart from IRAS4, the CS emission peak is shifted with respect to the dust continuum. The large-scale dust em ission mostly comes from material compressed around two cavities, whos e walls are detected in the H-2 S(1) v = 1-0 line. These cavities seem to have been excavated by outflows from the neighboring protostars IR AS4 and SVS13, and are now expanding in the ambient medium. Taken toge ther these new data suggest that the large cavity in NGC1333 grows by local action of stars forming in the compressed edge, each producing a local cavity which eventually overlap.