Gas infall in the massive star formation core G192.16–3.84

作     者：Meng-Yao Tang Sheng-Li Qin Tie Liu Yue-Fang Wu 

作者机构：Department of Astronomy Yunnan University and Key Laboratory of Astroparticle Physics of Yunnan Province Korea Astronomy and Space Science Institute East Asian Observatory Department of Astronomy Peking University 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2019年第19卷第3期

页      面：71-78页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supportedby the National Key R&D Program of China (No.2017YFA0402701) by the National Natural Science Foundation of China (Grant Nos. 11373026 and11433004) the Joint Research Fund in Astronomy(U1631237) under cooperative agreement between the National Natural Science Foundation of China and Chinese Academy of Sciences by the Top TalentsProgram of Yunnan Province (2015HA030) by Yunnan University’s Research Innovation Fund for Graduate Students 

主　　题：ISM individual objects(G192.16-3.84)-ISM molecules-stars formation 

摘      要：Previous observations have revealed an accretion disk and outflow motion in the high-mass starforming region G192.16–3.84, but collapse has not been reported before. Here we present molecular line and continuum observations toward the massive core G192.16–3.84 with the Submillimeter Array. C18 O(2–1) and HCO+(3–2) lines show pronounced blue profiles, indicating gas infalling in this region. This is the first time that infall motion has been reported in the G192.16–3.84 core. Two-layer model fitting gives infall velocities of 2.0±0.2 and 2.8±0.1 km s-1. Assuming that the cloud core follows a power-law density profile(ρ∝ r1.5), the corresponding mass infall rates are(4.7±1.7)×10-3 and(6.6±2.1)×10-3 M⊙yr-1 for C18 O(2–1) and HCO+(3–2), respectively. The derived infall rates are in agreement with the turbulent core model and those in other high-mass star-forming regions, suggesting that high accretion rate is a general requirement for forming a massive star.