Infall and Outflow Motions in the High-mass Star-forming Complex G9.62+0.19

We present the results of a high-resolution study with the Submillimeter Array toward the massive star-forming complex G9.62+0.19. Three submillimeter cores are detected in this region. The masses are 13, 30, and 165 M 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 X 10--3 M yr--1. In the southern core, a bipolar outflow with a total mass about 26 M and a mass-loss rate of 3.6 X 10--5 M yr--1 is revealed in SO (87-77) line wing emission. CS (7-6) and HCN (4-3) lines trace higher velocity gas than SO (87-77). 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 centimeter/millimeter cores in this region is also analyzed. The results support that ultracompact H II regions have a higher blue excess than their precursors.