The Possibly Remnant Massive Outflow in G5.89-0.39. I. Observations and Initial Magnetohydrodynamic Simulations

We have obtained maps of the large-scale outflow associated with the UC H II region G5.89-0.39 in CO and 13CO (J = 3-2), SiO (J = 8-7, J = 5-4), SO2 (J = 132,12-131,13),13 and H13CO+(J = 4-3). From these maps we have been able to determine the mass (3.3 M☉), momentum (96 M☉ km s-1), energy (3.5 × 1046 ergs), mechanical luminosity (141 L☉), and mass-loss rate (~ 1 × 10-3 M☉ yr-1) in the large-scale outflow. The observationally derived parameters were used to guide three-dimensional magnetohydrodynamic models of the jet-entrained outflow. Through the combination of observations and simulations, we suggest that the large-scale outflow may be inclined by approximately 45° to the line of sight, and that the jet entraining the observed molecular outflow may have been active for as little as 1000 years, half the kinematic age of the outflow.