Infall in massive clumps harboring bright infrared sources  

作　　者：Ying-Hua Yue Sheng-Li Qin Tie Liu Meng-Yao Tang Yuefang Wu Ke Wang Chao Zhang 

机构地区：[1]Department of Astronomy,Yunnan University,and Key Laboratory of Astroparticle Physics of Yunnan Province,Kunming,650091,China [2]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 20030,China [3]Department of Astronomy,Peking University,Beijing 100871,China [4]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China

出　　处：《Research in Astronomy and Astrophysics》2021年第1期136-142,共7页天文和天体物理学研究（英文版）

基　　金：the National Key Reasearch and Development Program of China(Nos.2017YFA0402701 and 2019YFA0405100);the National Natural Science Foundation of China(U1631237,11973013,11721303,11373026 and 11433004);the starting grant at the Kavli Institute for Astronomy and Astrophysics,Peking University(7101502016)。

摘　　要：Thirty massive clumps associated with bright infrared sources were observed to detect the infall signatures and characterize infall properties in the envelope of the massive clumps by APEX telescope in CO(4-3)and C17O(3-2)lines.Eighteen objects exhibit a"blue profile"in the CO(4-3)line with virial parameters less than 2,suggesting that global collapse is taking place in these massive clumps.The CO(4-3)lines were fitted via the two-layer model in order to obtain infall velocities and mass infall rates.Derived mass infall rates range from 10-3 to 10-1 M☉yr*(-1).A positive relationship between clump mass and infall rate appears to indicate that gravity plays a dominant role in the collapsing process.Higher luminosity clumps have a larger mass infall rate,implying that those clumps with higher mass infall rates possess a higher star formation rate.

关 键 词：stars:formation ISM:clouds ISM:molecules 

分 类 号：P144[天文地球—天体物理]