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Clump-scale Gas Infall in High-mass Star Formation: A Multitransition View with James Clerk Maxwell Telescope HCN (4-3) Mapping

文献类型：期刊论文

作者Xu, Fengwei1,3; Wang, Ke3; He, Yuxin2,4; Wu, Jingwen5,8; Zhu, Lei7; Mardones, Diego6
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期2023-12-01
卷号269期号:2页码:38
ISSN号0067-0049
DOI10.3847/1538-4365/acfee2
产权排序3
英文摘要Gas infall motions play a crucial role in high-mass star formation and are characterized by observable signatures of blueshifted asymmetric spectral line profiles ("blue profiles"). However, the connection between blue profiles and infall motions is unclear due to complex gas motions at parsec scales. In this study, we present the results of an HCN (4-3) mapping survey conducted with the James Clerk Maxwell Telescope, toward 38 massive clumps exhibiting blue profiles in HCO+ (3-2). We extract 34 HCN cores from the 38 observed fields. The core-averaged spectra show various line profiles, indicating that blue-profile HCO+ (3-2) does not guarantee the same in HCN (4-3). Through non-LTE radiative-transfer calculations, we attribute the low detection rate of high-J blue profiles to a combination of insufficient HCN (4-3) opacity and the intricate gas motion across different density layers. A comparison between the MALT90 and Bolocam Galactic Plane Survey line surveys highlights the importance of appropriate tracers, high spectral resolution, and column density thresholds when searching for blue profiles. We select 11 reliable infall candidates and adopt the Hill5 model to fit the infall velocity of 0.2-1.6 km s-1, corresponding to 5%-74% of freefall velocity. Assuming a spherically collapsing model, we estimate the median and mean mass infall rates to be 4.5 x 10-3 and 7.6 x 10-3 M circle dot yr-1, respectively. The consistency of the mass infall rates among different transitions suggests a steady accretion process from the clump gas envelope to the inner region.
WOS关键词GALACTIC PLANE ; LINE-PROFILES ; MOLECULAR CLUMPS ; TRIGONOMETRIC PARALLAXES ; FORMING REGIONS ; INFLOW MOTIONS ; COLLAPSE ; CATALOG ; CORES ; SIGNATURES
资助项目National Science Foundation of China[11973013] ; National Science Foundation of China[12033005] ; China Manned Space Project[CMS-CSST-2021-A09] ; National Key R&D Program of China[2022YFA1603102] ; National Key R&D Program of China[2017YFA0402700] ; High-Performance Computing Platform of Peking University ; Chinese Academy of Sciences (CAS) Light of West China Program[2020XBQNXZ-017] ; Canadian Space Agency ; Science and Technology Facilities Council of the United Kingdom ; [M16AP067] ; [M19BP033] ; [M22AP051]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001102188400001
出版者IOP Publishing Ltd
资助机构National Science Foundation of China ; China Manned Space Project ; National Key R&D Program of China ; High-Performance Computing Platform of Peking University ; Chinese Academy of Sciences (CAS) Light of West China Program ; Canadian Space Agency ; Science and Technology Facilities Council of the United Kingdom
源URL[http://ir.xao.ac.cn/handle/45760611-7/5603]  
专题恒星形成与演化研究团组
通讯作者Wang, Ke
作者单位1.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
6.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile
7.Chinese Acad Sci, CAS Key Lab FAST, Natl Astron Observ, Beijing, Peoples R China
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Fengwei,Wang, Ke,He, Yuxin,et al. Clump-scale Gas Infall in High-mass Star Formation: A Multitransition View with James Clerk Maxwell Telescope HCN (4-3) Mapping[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2023,269(2):38.
APA Xu, Fengwei,Wang, Ke,He, Yuxin,Wu, Jingwen,Zhu, Lei,&Mardones, Diego.(2023).Clump-scale Gas Infall in High-mass Star Formation: A Multitransition View with James Clerk Maxwell Telescope HCN (4-3) Mapping.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,269(2),38.
MLA Xu, Fengwei,et al."Clump-scale Gas Infall in High-mass Star Formation: A Multitransition View with James Clerk Maxwell Telescope HCN (4-3) Mapping".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 269.2(2023):38.

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