Dense cores and molecular outflows in the OMC-2/3 region

We have observed the OMC-2/3 region in the (HCO+)-C-13(1-0), HCO+(1-0), and CO(1-0) lines by using the Nobeyama 45 m radio telescope. We have identifi ed 18 dense cores in (HCO+)-C-13 and eight molecular outflows in CO and HCO + in OMC-2/3. Four of these outflows are newly found. The line widths of th e H'3CO+ cores in OMC-2/3 are twice as large as those in dark clouds, and t he momentum fluxes ((P) over dot(flow) = P-flow/tau (D) = (M) over dot(flow ) V-flow) Of the outflows in OMC-2/3 are approximately 2 orders of magnitud e larger than those of outflows in dark clouds. We found that the mass-loss rate of the outflow is proportional to the third power of the core velocit y dispersion, which suggests that the outflow mass-loss rate is proportiona l to the mass infall rate onto the protostar. From a comparison between the properties of cores associated with protostars and those without protostar s, we suggest that the dissipation of turbulence initiates star formation.