THE SLOW IONIZED WIND AND ROTATING DISKLIKE SYSTEM THAT ARE ASSOCIATED WITH THE HIGH-MASS YOUNG STELLAR OBJECT G345.4938+01.4677

Guzman A.E.; Garay, G.; Rodríguez L.F.; Moran, J.; Brooks K.J.; Bronfman, L.; Nyman L.-A.; Sanhueza P.; Mardones, D.

Keywords: ISM: individual objects (IRAS 16562, 3959); ISM: jets and outflows; Stars: formation; Stars: individual (G345.4938+01.4677); Stars: jets

Abstract

We report the detection, made using ALMA, of the 92 GHz continuum and hydrogen recombination lines (HRLs) H40 alpha, H42 alpha, and H50 beta emission toward the ionized wind associated with the high-mass young stellar object G345.4938+01.4677. This is the luminous central dominating source located in the massive and dense molecular clump associated with IRAS 16562-3959. The HRLs exhibit Voigt profiles, which is a strong signature of Stark broadening. We successfully reproduce the observed continuum and HRLs simultaneously using a simple model of a slow ionized wind in local thermodynamic equilibrium, with no need for a high-velocity component. The Lorentzian line wings imply electron densities of 5 x 10(7) cm(-3) on average. In addition, we detect SO and SO2 emission arising from a compact (similar to 3000 AU) molecular core associated with the central young star. The molecular core exhibits a velocity gradient that is perpendicular to the jet-axis, which we interpret as evidence of rotation. The set of observations toward G345.4938+01.4677 are consistent with it being a young high-mass star associated with a slow photo-ionized wind.

Más información

Título según WOS: THE SLOW IONIZED WIND AND ROTATING DISKLIKE SYSTEM THAT ARE ASSOCIATED WITH THE HIGH-MASS YOUNG STELLAR OBJECT G345.4938+01.4677
Título según SCOPUS: The slow ionized wind and rotating disklike system that are associated with the high-mass young stellar object G345.4938+01.4677
Título de la Revista: ASTROPHYSICAL JOURNAL
Volumen: 796
Número: 2
Editorial: IOP PUBLISHING LTD
Fecha de publicación: 2014
Idioma: English
DOI:

10.1088/0004-637X/796/2/117

Notas: ISI, SCOPUS