2010ApJ...725.2190L

We report the arcsecond resolution Submillimeter Array observations of the ¹²CO (2-1) transition in the massive cluster-forming region G10.6-0.4. In these observations, the high-velocity ¹²CO emission is resolved into individual outflow systems, which have a typical size scale of a few arcseconds. These molecular outflows are energetic and are interacting with the ambient molecular gas. By inspecting the shock signatures traced by CH₃OH, SiO, and HCN emissions, we suggest that abundant star formation activities are distributed over the entire 0.5 pc scale dense molecular envelope. The star formation efficiency over one global free-fall timescale (of the 0.5 pc molecular envelope, ∼10⁵ years) is about a few percent. The total energy feedback of these high-velocity outflows is higher than 10⁴⁷ erg, which is comparable to the total kinetic energy in the rotational motion of the dense molecular envelope. From order-of-magnitude estimations, we suggest that the energy injected from the protostellar outflows is capable of balancing the turbulent energy dissipation. No high-velocity bipolar molecular outflow associated with the central OB cluster is directly detected, which can be due to the photoionization.