Abstract
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 1 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 × 10 -3 M 1 yr -1 . In the southern core, a bipolar outflow with a total mass about 26 M 1 and a mass-loss rate of 3.6 × 10 -5 M 1 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 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. © 2011. The American Astronomical Society. All rights reserved.