Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile e-mail: email@example.com
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
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