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Kinematics and star formation of hub-filament systems in W49A

文献类型：期刊论文

作者Zhang, Wenjun2,3; Zhou, Jianjun1,2,4; Esimbek, Jarken1,2,4; Baan, Willem2,5; He, Yuxin1,2,3,4; Tang, Xindi1,2,3,4; Li, Dalei1,2,3,4; Ji, Weiguang2; Wu, Gang2,6; Ma, Yingxiu2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2024-08-08
卷号688页码:A99
关键词ISM: bubbles ISM: clouds evolution H II regions ISM: kinematics and dynamics ISM: structure
ISSN号0004-6361
DOI10.1051/0004-6361/202348580
产权排序1
英文摘要Aims. W49A is a prominent giant molecular cloud (GMC) that exhibits strong star formation activities, yet its structural and kinematic properties remain uncertain. Our study aims to investigate the large-scale structure and kinematics of W49A, and elucidate the role of filaments and hub-filament systems (HFSs) in its star formation activity. Methods. We utilized continuum data from Herschel and the James Clerk Maxwell Telescope (JCMT) as well as the molecular lines (CO)-C-12 (3-2), (CO)-C-13 (3-2), and (CO)-O-18 (3-2) to identify filaments and HFSs within W49A. Further analysis focused on the physical properties, kinematics, and mass transport within these structures. Additionally, recombination line emission from the H I/OH/Recombination (THOR) line survey was employed to trace the central H II region and ionized gas. Results. Our findings reveal that W49A comprises one blue-shifted (B-S) HFS and one red-shifted (R-S) HFS, each with multiple filaments and dense hubs. Notably, significant velocity gradients were detected along these filaments, indicative of material transport toward the hubs. High mass accretion rates along the filaments facilitate the formation of massive stars in the HFSs. Furthermore, the presence of V-shaped structures around clumps in position-velocity diagrams suggests ongoing gravitational collapse and local star formation within the filaments. Conclusions. Our results indicate that W49A consists of one R-S HFS and one B-S HFS, and that the material transport from filaments to the hub promotes the formation of massive stars in the hub. These findings underscore the significance of HFSs in shaping the star formation history of W49A.
WOS关键词HI/OH/RECOMBINATION LINE SURVEY ; INFRARED DARK CLOUDS ; MOLECULAR CLOUD ; GRAVITATIONAL COLLAPSE ; ACCRETION FLOWS ; MASSIVE STARS ; HI-GAL ; REGION ; CATALOG ; FRAGMENTATION
资助项目National Key R&D Program of China[2022YFA1603103] ; National Key R&D Program of China[2023YFA1608002] ; National Natural Science foundation of China (NSFC)[12373029] ; National Natural Science foundation of China (NSFC)[12173075] ; National Natural Science foundation of China (NSFC)[12103082] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01E06] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01A359] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01A362] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2023D01A11] ; Tianshan Talent Program of Xinjiang Uygur Autonomous Region[2022TSYCLJ0005] ; Tianchi Talents Program of Xinjiang Uygur Autonomous Region ; Chinese Academy of Sciences (CAS)[2020-XBQNXZ-017] ; Chinese Academy of Sciences (CAS)[2021-XBQNXZ-028] ; Chinese Academy of Sciences (CAS)[2022-XBJCTD-003] ; Chinese Academy of Sciences (CAS)[xbzg-zdsys-202212] ; Regional Collaborative Innovation Project of XinJiang Uyghur Autonomous Region[2022E01050] ; Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan[AP13067768] ; Chinese Academy of Sciences President International Fellowship Initiative[2023VMA0030]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001289290700014
出版者EDP SCIENCES S A
资助机构National Key R&D Program of China ; National Natural Science foundation of China (NSFC) ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; Tianshan Talent Program of Xinjiang Uygur Autonomous Region ; Tianchi Talents Program of Xinjiang Uygur Autonomous Region ; Chinese Academy of Sciences (CAS) ; Regional Collaborative Innovation Project of XinJiang Uyghur Autonomous Region ; Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan ; Chinese Academy of Sciences President International Fellowship Initiative
源URL[http://ir.xao.ac.cn/handle/45760611-7/6947]  
专题恒星形成与演化研究团组
通讯作者Zhang, Wenjun; Zhou, Jianjun
作者单位1.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
2.Chinese Acad Sci, XingJiang Astron Observ, Urumqi 830011, Peoples R China
3.Univ Chinese Acad Sci, ,, Beijing 100049, Peoples R China
4.Xinjiang Key Lab Radio Astrophys, Urumqi 830011, Peoples R China
5.ASTRON, Netherlands Inst Radio Astron, NL-7991 PD Dwingeloo, Netherlands
6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
7.Nazarbayev Univ, Energet Cosmos Lab, Astana 010000, Kazakhstan
8.Al Farabi Kazakh Natl Univ, Fac Phys & Technol, Alma Ata 050040, Kazakhstan
推荐引用方式
GB/T 7714		 Zhang, Wenjun,Zhou, Jianjun,Esimbek, Jarken,et al. Kinematics and star formation of hub-filament systems in W49A[J]. ASTRONOMY & ASTROPHYSICS,2024,688:A99.
APA Zhang, Wenjun.,Zhou, Jianjun.,Esimbek, Jarken.,Baan, Willem.,He, Yuxin.,...&Komesh, Toktarkhan.(2024).Kinematics and star formation of hub-filament systems in W49A.ASTRONOMY & ASTROPHYSICS,688,A99.
MLA Zhang, Wenjun,et al."Kinematics and star formation of hub-filament systems in W49A".ASTRONOMY & ASTROPHYSICS 688(2024):A99.

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来源：新疆天文台

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