Evidence of a SiO collimated outflow from a massive YSO in IRAS 17233-3606

TL;DR

This study presents evidence of a collimated SiO outflow from a high-mass young stellar object in IRAS 17233-3606, demonstrating similarities with low-mass protostellar jets and modeling shock properties effectively.

Contribution

It is the first detailed modeling of SiO emission in a high-mass star-forming region, showing parallels with low-mass star outflows and estimating outflow parameters.

Findings

The outflow is compact and collimated, similar to low-mass protostellar jets.

Shock modeling yields high pre-shock densities and outflow masses consistent with early B-type stars.

SiO emission can be modeled similarly in high-mass and low-mass star-forming regions.

Abstract

Studies of molecular outflows in high-mass young stellar objects reveal important information about the formation process of massive stars. We therefore selected the close-by IRAS 17233-3606 massive star-forming region to perform SiO observations with the SMA interferometer in the (5-4) line and with the APEX single-dish telescope in the (5-4) and (8-7) transitions. In this paper, we present a study of one of the outflows in the region, OF1, which shows several properties similar to jets driven by low-mass protostars, such as HH211 and HH212. It is compact and collimated, and associated with extremely high velocity CO emission, and SiO emission at high velocities. We used a state-of-the-art shock model to constrain the pre-shock density and shock velocity of OF1. The model also allowed us to self-consistently estimate the mass of the OF1 outflow. The shock parameters inferred by the SiO modelling are comparable with those found for low-mass protostars, only with higher pre-shock density values, yielding an outflow mass in agreement with those obtained for molecular outflows driven by early B-type young stellar objects. Our study shows that it is possible to model the SiO emission in high-mass star-forming regions in the same way as for shocks from low-mass young stellar objects.