A&A 463, 217-224 (2007)
Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247G. Garay1, D. Mardones1, L. Bronfman1, K. J. Brooks2, L. F. Rodríguez3, R. Güsten4, L.-Å. Nyman5, R. Franco-Hernández6, and J. M. Moran6
1 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
2 Australia Telescope National Facility, PO Box 76, Epping 1710 NSW, Australia
3 Centro de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72, Morelia, Michoacán, 58089, México
4 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
5 European Southern Observatory, Casilla 19001, Santiago, Chile
6 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
(Received 30 March 2006 / Accepted 16 November 2006)
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 ~18´´.
Methods.The observations were made using the Atacama Pathfinder Experiment Telescope in the transitions of 12CO and 13CO, transitions of HCO+ and H13CO+, and transition of CS.
Results.Our observations reveal the presence of a collimated bipolar outflow with lobes ~0.7 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 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 ~120 km s-1. The outflow is massive and energetic (flow mass ~110 ; mass outflow rate ~ yr-1; momentum ~ km s-1 and kinetic energy ~ erg), and has a dynamical time scale of yr. These parameters are consistent with the flow being driven by a young massive stellar object with .
Key words: ISM: jets and outflows -- ISM: molecules -- stars: formation
© ESO 2007