ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex
文献类型：期刊论文
| 作者 | Liu, Tie1,2,3,4; Lacy, John5; Li, Pak Shing6; Wang, Ke7; Qin, Sheng-Li8,9; Zhang, Qizhou10; Kim, Kee-Tae1; Garay, Guido11; Wu, Yuefang12; Mardones, Diego11 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-11-01 |
| 卷号 | 849期号:1页码:21 |
| 关键词 | H II regions ISM: jets and outflows ISM: kinematics and dynamics stars: formation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa8d73 |
| 通讯作者 | Liu, Tie(liutiepku@gmail.com) |
| 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 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22265]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Liu, Tie |
| 作者单位 | 1.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 2.Chinese Acad Sci, South Amer Ctr Astrophys CASSACA Cerro Calan, Camino Observ 1515, Santiago, Chile 3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 4.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA 5.Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA 6.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA 7.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 8.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China 9.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China 10.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA |
| 推荐引用方式 GB/T 7714 | Liu, Tie,Lacy, John,Li, Pak Shing,et al. ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex[J]. ASTROPHYSICAL JOURNAL,2017,849(1):21. |
| APA | Liu, Tie.,Lacy, John.,Li, Pak Shing.,Wang, Ke.,Qin, Sheng-Li.,...&Li, Di.(2017).ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex.ASTROPHYSICAL JOURNAL,849(1),21. |
| MLA | Liu, Tie,et al."ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex".ASTROPHYSICAL JOURNAL 849.1(2017):21. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。