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ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex

文献类型：期刊论文

作者Hirota, Tomoya5; Ren, Zhiyuan4; Liu, Sheng-Yuan3; Lacy, John13; Zhu, Qingfeng6; Mardones, Diego8; Wu, Yuefang7; Garay, Guido8; Kim, Kee-Tae17; Liu, Tie14,15,16,17
刊名ASTROPHYSICAL JOURNAL
出版日期2017-11-01
卷号849期号:1
关键词h Ii Regions Ism: Jets And Outflows Ism: Kinematics And Dynamics Stars: Formation
DOI10.3847/1538-4357/aa8d73
文献子类Article
英文摘要Stellar feedback from high-mass stars (e.g., H II regions) can strongly influence the surrounding interstellar medium and regulate star formation. Our new ALMA observations reveal sequential high-mass star formation taking place within one subvirial filamentary clump (the G9.62 clump) in the G9.62+0.19 complex. The 12 dense cores (MM1-MM12) detected by ALMA are at very different evolutionary stages, from the starless core phase to the UC H II region phase. Three dense cores (MM6, MM7/G, MM8/F) are associated with outflows. The mass-velocity diagrams of the outflows associated with MM7/G and MM8/F can be well-fit by broken power laws. The mass-velocity diagram of the SiO outflow associated with MM8/F breaks much earlier than other outflow tracers (e.g., CO, SO, CS, HCN), suggesting that SiO traces newly shocked gas, while the other molecular lines (e.g., CO, SO, CS, HCN) mainly trace the ambient gas continuously entrained by outflow jets. Five cores (MM1, MM3, MM5, MM9, MM10) are massive starless core candidates whose masses are estimated to be larger than 25 M-circle dot, assuming a dust temperature of <= 20 K. The shocks from the expanding H II regions ("B" and "C") to the west may have a great impact on the G9.62 clump by compressing it into a filament and inducing core collapse successively, leading to sequential star formation. Our findings suggest that stellar feedback from H II regions may enhance the star formation efficiency and suppress low-mass star formation in adjacent pre-existing massive clumps.
WOS关键词H-II REGIONS ; YOUNG STELLAR OBJECTS ; INTERSTELLAR GAS LAYERS ; COMPETITIVE ACCRETION ; MOLECULAR OUTFLOWS ; FORMING REGION ; HII-REGIONS ; PROTOSTELLAR CANDIDATES ; GRAVITATIONAL COLLAPSE ; CO OUTFLOWS
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000425465900007
资助机构KASI fellowship ; KASI fellowship ; EACOA fellowship ; EACOA fellowship ; Peking University, Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) ; Peking University, Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) ; Universidad de Chile ; Universidad de Chile ; National Natural Science Foundation of China (NSFC)(U1631237) ; National Natural Science Foundation of China (NSFC)(U1631237) ; Chinese Academy of Sciences (CAS)(U1631237) ; Chinese Academy of Sciences (CAS)(U1631237) ; Top Talents Program of Yunnan Province(2015HA030) ; Top Talents Program of Yunnan Province(2015HA030) ; German Research Foundation (DFG)(WA3628-1/1 ; German Research Foundation (DFG)(WA3628-1/1 ; 1573) ; 1573) ; KASI fellowship ; KASI fellowship ; EACOA fellowship ; EACOA fellowship ; Peking University, Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) ; Peking University, Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) ; Universidad de Chile ; Universidad de Chile ; National Natural Science Foundation of China (NSFC)(U1631237) ; National Natural Science Foundation of China (NSFC)(U1631237) ; Chinese Academy of Sciences (CAS)(U1631237) ; Chinese Academy of Sciences (CAS)(U1631237) ; Top Talents Program of Yunnan Province(2015HA030) ; Top Talents Program of Yunnan Province(2015HA030) ; German Research Foundation (DFG)(WA3628-1/1 ; German Research Foundation (DFG)(WA3628-1/1 ; 1573) ; 1573)
源URL[http://ir.bao.ac.cn/handle/114a11/20297]  
专题国家天文台_射电天文研究部
作者单位1.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 106, Taiwan
4.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
5.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
6.Univ Sci & Technol, Chinese Acad Sci, Astron Dept, Hefei 210008, Anhui, Peoples R China
7.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
8.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile
9.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
10.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China
推荐引用方式
GB/T 7714		 Hirota, Tomoya,Ren, Zhiyuan,Liu, Sheng-Yuan,et al. ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex[J]. ASTROPHYSICAL JOURNAL,2017,849(1).
APA Hirota, Tomoya.,Ren, Zhiyuan.,Liu, Sheng-Yuan.,Lacy, John.,Zhu, Qingfeng.,...&Chen, Huei-Ru.(2017).ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex.ASTROPHYSICAL JOURNAL,849(1).
MLA Hirota, Tomoya,et al."ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex".ASTROPHYSICAL JOURNAL 849.1(2017).

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