Infall and outflow motions in the high-mass star forming complex G9.62+0.19

TL;DR

This study uses high-resolution submillimeter observations to analyze infall and outflow motions in the G9.62+0.19 high-mass star forming complex, revealing detailed dynamics, core properties, and evolutionary insights.

Contribution

It provides the first detailed high-resolution analysis of infall and outflow motions in G9.62+0.19, identifying the driving source and analyzing chemical abundances and evolutionary stages.

Findings

Infall detected in the middle core with a rate of 4.3e-3 M_sun/yr.

A bipolar outflow with 26 M_sun mass and specific mass-loss rate identified in the southern core.

Mass-velocity diagrams fit by a single power law, indicating outflow dynamics.

Abstract

We present the results of a high resolution study with the Submillimeter Array towards the massive star forming complex G9.62+0.19. Three sub-mm cores are detected in this region. The masses are 13, 30 and 165 M$_{\sun}$ for the northern, middle and southern dust cores, respectively. Infall motions are found with HCN (4-3) and CS (7-6) lines at the middle core (G9.62+0.19 E). The infall rate is $4.3\times10^{-3}~M_{\odot}\cdot$yr$^{-1}$. In the southern core, a bipolar-outflow with a total mass about 26 M$_{\sun}$ and a mass-loss rate of $3.6\times10^{-5}~M_{\odot}\cdot$yr$^{-1}$ is revealed in SO ($8_{7}-7_{7}$) line wing emission. CS (7-6) and HCN (4-3) lines trace higher velocity gas than SO ($8_{7}-7_{7}$). G9.62+0.19 F is confirmed to be the driving source of the outflow. We also analyze the abundances of CS, SO and HCN along the redshifted outflow lobes. The mass-velocity diagrams of the outflow lobes can be well fitted by a single power law. The evolutionary sequence of the cm/mm cores in this region are also analyzed. The results support that UC~H{\sc ii} regions have a higher blue excess than their precursors.