2007A&A...463..217G

We present molecular line observations of the molecular core associated with IRAS 16547-4247, which have allowed us to determine its physical and kinematical properties at angular resolutions of ∼18". The observations were made using the Atacama Pathfinder Experiment Telescope in the J=3->2 transitions of ¹²CO and ¹³CO, J=4->3 transitions of HCO⁺ and H¹³CO⁺, and J=7->6 transition of CS. Our observations reveal the presence of a collimated bipolar outflow with lobes ∼0.7pc in extent and aligned with the thermal jet located at the center of the core. The morphology and velocity structure of the flow are well described by a biconical outflow that is inclined from the line of sight by an angle of 84°, has a semi-opening angle of 14°, and in which the gas moves outwards with a constant total velocity, with respect to the cone apex, of ∼120km/s. The outflow is massive and energetic (flow mass ∼110M_☉; mass outflow rate ∼2x10^–2M_☉/yr; momentum ∼2x10³M_☉*km/s and kinetic energy ∼9x10⁴⁷erg), and has a dynamical time scale of 6x10³ yr. These parameters are consistent with the flow being driven by a young massive stellar object with L_bol∼6x10⁴L_☉.