Star formation in Perseus III. Outflows

摘要: Context. We present a search for outflows towards 51 submillimetre cores in the Perseus molecular cloud. Aims. Our first objective is to identify protostellar population through detection of outflows. second aim consistently derive outflow properties from large homogeneous dataset within one cloud order investigate further mass dependence and time evolution loss. Methods. used James Clerk Maxwell Telescope map $2'$ $\times$ $2'$ regions around each core 12 CO 3–2. Where were detected we derived momentum fluxes. Results. Of cores, 37 show broad linewings indicative In 13 cases, could be due confusion with neighbouring flows but 9 those sources also have near-infrared detections confirming their nature. The total fraction protostars our sample 65%. All four are confirmed as by Spitzer IR only source has no outflow, showing that maps at this sensitivity equally good identifying Spitzer. Outflow flux correlates both luminosity there considerable scatter even despite dataset. fail confirm result Bontemps et al. (1996) Class I lower fluxes on average than Class 0 sources, KS test significant probability Class 0s Class Is drawn same distribution. Conclusions. find power may not simple decline between stages. includes low flux, low-luminosity possibly very early evolutionary stage. If loss outflows, would last 10 5 –10 8  years, longer current estimates 1.5–4 $\times$  years mean lifetime embedded phase. Additional mechanisms removing necessary.