High Resolution Imaging of Molecular Outflows in Massive Young Stars

Abstract

We present high angular resolution observations toward two massive star forming regions IRAS 18264-1152 and IRAS 23151+5912 with the Plateau de Bure Interferometer (PdBI) in the SiO (J=2-1) and H${}^{13}$CO${}^{+}$ (J=1-0) lines and at 1.3 mm and 3.4 mm continuum, and with the Very Large Array (VLA) in the NH${}_3$ (J,K)=(1,1), (2,2) lines. The NH${}_3$ (1,1) and (2,2) emission is detected toward IRAS 18264-1152 only. For IRAS 18264-1152, the SiO observations reveal at least two quasi-perpendicular outflows with high collimation factors, and the most dominant feature is a redshifted jet-like outflow with very high velocities up to about $\Delta v=60$ kms${}^{-1}$ with respect to the systemic velocity. The very-high-velocity component ($\Delta v=22-60$ kms${}^{-1}$) of this outflow is spatially offset from its high-velocity ($\Delta v=3-21$ kms${}^{-1}$) component. The SiO line profiles and position-velocity characteristics of these two components suggest that this outflow can be driven by an underlying precessing jet. For IRAS 23151+5912, the bipolar but mainly blueshifted SiO outflow coincides with the inner parts of the single-dish CO outflow. In particular the quasi-parabolic shape of the blueshifted outflow coincides with the near-infrared nebulosity and is consistent with entrainment of the gas by an underlying wide-angle wind. The analysis of the molecular outflow data of the two luminous sources further support high-mass stars forming via a disk-mediated accretion process similar to low-mass stars.

Accepter for publication in The Astrophysical Journal

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