Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247
Aims. 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 âˆ¼18â€³. Methods. The observations were made using the Atacama Pathfinder Experiment Telescope in the J = 3 â†’ 2 transitions of 12CO and 13CO, J = 4 â†’ 3 transitions of HCO+ and H13CO+, and J = 7 â†’ 6 transition of CS. Results. Our observations reveal the presence of a collimated bipolar outflow with lobes âˆ¼0.7 pc 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 84Â°, has a semi-opening angle of 14Â°, and in which the gas moves outwards with a constant total velocity, with respect to the cone apex, of âˆ¼ 120 km s-1. The outflow is massive and energetic (flow mass âˆ¼ 110 MâŠ™; mass outflow rate âˆ¼2 Ã— 10-2 MâŠ™ yr-1; momentum âˆ¼2 Ã— 103 MâŠ™ km s-1 and kinetic energy âˆ¼9 Ã— 1047 erg), and has a dynamical time scale of 6 Ã— 103 yr. These parameters are consistent with the flow being driven by a young massive stellar object with Lbol âˆ¼ 6 Ã— 104 LâŠ™. Â© ESO 2007.
|Título según WOS:||Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247|
|Título según SCOPUS:||Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247|
|Título de la Revista:||ASTRONOMY ASTROPHYSICS|
|Editorial:||EDP SCIENCES S A|
|Fecha de publicación:||2007|
|Página de inicio:||217|