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Edge collapse and subsequent longitudinal accretion in filament S242

文献类型：期刊论文

作者Yuan, Lixia1,2,11; Li, Guang-Xing3; Zhu, Ming1,2,11; Liu, Tie4; Wang, Ke5; Liu, Xunchuan5,6; Kim, Kee-Tae7,8; Tatematsu, Ken'ichi9,10; Yuan, Jinghua1; Wu, Yuefang5,6
刊名ASTRONOMY & ASTROPHYSICS
出版日期2020-05-15
卷号637页码:13
关键词stars: formation ISM: kinematics and dynamics ISM: structure
ISSN号0004-6361
DOI10.1051/0004-6361/201936625
英文摘要Filament S242 is 25 pc long with massive clumps and YSO clusters concentrated in its end regions; it is considered a good example of edge collapse. We mapped this filament in the (CO)-C-12(1-0) and (CO)-C-13(1-0) lines. A large-scale velocity gradient along filament S242 has been detected; the relative velocity between the two end-clumps is 3 km s(-1), indicating an approaching motion between them. These signatures are consistent with the filament S242 being formed through the collapse of a single elongated entity, where an effect known as "gravitational focusing" drives the ends of the filament to collapse (edge collapse). Based on this picture, we estimate a collapse timescale of 4.2 Myr, which is the time needed for a finite and elongated entity evolving to the observed filament S242. For the whole filament, we find that increases in surface densities lead to increases in velocity dispersion, which can be consistently explained as the result of self-gravity. We also calculated the contribution of longitudinal collapse to the observed velocity dispersion and found it to be the dominant effect in driving the gas motion near the end-clumps. We propose that our filament S242 is formed through a two-stage collapse model, where the edge collapse of a truncated filament is followed by a stage of longitudinal accretion toward the dense end-clumps.
WOS关键词LARGE-SCALE STRUCTURE ; STAR-FORMATION ; CLOUD CORE ; FRAGMENTATION ; DEPLETION
资助项目National Key R&D Program of China[2017YFA0402600] ; NSFC[U1531246] ; NSFC[11503035] ; NSFC[11573036] ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; National Key Research and Development Program of China[2017YFA0402702] ; National Key Research and Development Program of China[2019YFA0405100] ; National Science Foundation of China[11973013] ; National Science Foundation of China[11721303] ; Kavli Institute for Astronomy and Astrophysics, Peking University[7101502016]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000536554100006
出版者EDP SCIENCES S A
资助机构National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Kavli Institute for Astronomy and Astrophysics, Peking University ; Kavli Institute for Astronomy and Astrophysics, Peking University ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Kavli Institute for Astronomy and Astrophysics, Peking University ; Kavli Institute for Astronomy and Astrophysics, Peking University ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Kavli Institute for Astronomy and Astrophysics, Peking University ; Kavli Institute for Astronomy and Astrophysics, Peking University ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; Key Laboratory of FAST, NAOC, Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Kavli Institute for Astronomy and Astrophysics, Peking University ; Kavli Institute for Astronomy and Astrophysics, Peking University
源URL[http://ir.bao.ac.cn/handle/114a11/54657]  
专题中国科学院国家天文台
通讯作者Yuan, Lixia
作者单位1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Key Lab FAST, NAOC, Beijing 100012, Peoples R China
3.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
6.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
7.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
8.Univ Sci & Technol Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea
9.Natl Inst Nat Sci, Nobeyama Radio Observ, Natl Astron Observ Japan, Minamisa Ku, 462-2 Nobeyama, Minamimaki, Nagano 3841305, Japan
10.SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
推荐引用方式
GB/T 7714		 Yuan, Lixia,Li, Guang-Xing,Zhu, Ming,et al. Edge collapse and subsequent longitudinal accretion in filament S242[J]. ASTRONOMY & ASTROPHYSICS,2020,637:13.
APA Yuan, Lixia.,Li, Guang-Xing.,Zhu, Ming.,Liu, Tie.,Wang, Ke.,...&Wu, Yuefang.(2020).Edge collapse and subsequent longitudinal accretion in filament S242.ASTRONOMY & ASTROPHYSICS,637,13.
MLA Yuan, Lixia,et al."Edge collapse and subsequent longitudinal accretion in filament S242".ASTRONOMY & ASTROPHYSICS 637(2020):13.

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