2011ApJ...736..150G

We report molecular line observations in the CO J = 3 ⟶ 2, 6 ⟶ 5, and 7 ⟶ 6 transitions, made using the Atacama Pathfinder Experiment Telescope, toward the massive and dense core IRAS 16562-3959. This core harbors a string of radio sources thought to be powered by a central collimated jet of ionized gas. The molecular observations show the presence of high-velocity gas exhibiting a quadrupolar morphology, most likely produced by the presence of two collimated outflows. The southeast-northwest (SE-NW) molecular outflow is aligned with the string of radio continuum sources, suggesting it is driven by the jet. We find that the excitation temperature of the gas in the SE-NW outflow is high, with values of 145 and 120 K for the blueshifted and redshifted lobes, respectively. This outflow has a total mass of 1.92 M_☉, a total momentum of ∼89 M_☉ km/s, and an averaged momentum rate of ∼3.0x10^–2 M_☉ km/s/yr, values characteristic of flows driven by young massive stellar objects with high luminosities (L_bol∼ 2x10⁴ L_☉). Complementary data taken with the Atacama Submillimeter Telescope Experiment in high density and shock tracers support the picture that IRAS 16562-3959 is an accreting young massive star associated with an ionized jet, which is the energy source of a molecular outflow.