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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2019,（3）
• 页码范围: 71-78
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/19/3/40

摘要

Previous observations have revealed an accretion disk and outflow motion in the high-mass starforming region G 192.16-3.84,but collapse has not been reported before.Here we present molecular line and continuum observations toward the massive core G 192.16-3.84 with the Submillimeter Array.C18O(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 G 192.16-3.84 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 ∝ rl5),the corresponding mass infall rates are (4.7±1.7)×10-3 and (6.6±2.1)×10-3M⊙ yr-1 for C18O(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.