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The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow

文献类型：期刊论文

作者Lin, Shuting2; Feng, Siyi2; Sanhueza, Patricio3; Wang, Ke4,5; Zhang, Zhi-Yu6,7; Zhang, Yichen8; Xu, Fengwei4,5; Wang, Junzhi9; Morii, Kaho10,11,12; Liu, Hauyu Baobab13,14
刊名ASTROPHYSICAL JOURNAL
出版日期2025-09-10
卷号990期号:2页码:229
ISSN号0004-637X
DOI10.3847/1538-4357/adf208
产权排序17
英文摘要Outflows are key indicators of ongoing star formation. We report the discovery of an unanchored forked stream within the propagating path of an extremely young protostellar outflow in the 70 mu m-dark clump G34.74-0.12, based on Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations with an angular resolution of 1 . '' 6 (similar to 5000 au). This outflow originates from a 9.7 M-circle dot core, exhibits a fork-shaped stream structure in its redshifted lobe, which is traced by CO (2-1), SiO (5-4), and H2CO (3(0,3)-2(0,2)). It has a momentum of 13 M-circle dot km s(-1), an energy of 107 M-circle dot km(2) s(-2), and a dynamical timescale of similar to 10(4) yr. Significantly, the enhanced relative abundances of SiO, H2CO, and CH3OH with respect to CO, along with the increased temperature at the forked point, indicate a collisional origin. The forked point does not coincide with any dust continuum core >0.1 M-circle dot. Moreover, CO (2-1) emission also traces three other outflows in this region, characterized by their masses (0.40, 0.02, and 0.15 M-circle dot) and momenta (5.2, 0.2, and 1.8 M-circle dot km s(-1)), as part of the ALMA Survey of 70 mu m dark High-mass clumps in Early Stages project. All the newly discovered morphological and kinematic features associated with these extremely young protostellar outflows (with timescales of 10(3)-10(4) yr) suggest that the initial stages of star formation are more complicated than previously understood.
WOS关键词STAR-FORMING REGIONS ; MOLECULAR OUTFLOWS ; CHEMICAL-STRUCTURE ; EARLIEST PHASES ; MAGNETIC-FIELD ; FORMATION EPOS ; ACCRETION ; SIO ; CORE ; DRIVEN
资助项目MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[2017.1.00716] ; ALMA[2025YFE0108200] ; National Key R&D program of China[12373023] ; National Key R&D program of China[1213308] ; National Science Foundation of China[JP22H01271] ; National Science Foundation of China[JP23H01221] ; Xiamen University[2020AFB3FX] ; Xiamen University[2022JC2Y93] ; Xiamen University[2023 MIGLIORA (F83C23000800005)] ; Xiamen University[INAF-GO 2023] ; Xiamen University[C13C23000770005] ; Xiamen University[2023 TRIESTE] ; JSPS
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001570455900001
出版者IOP Publishing Ltd
资助机构MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809 ; ALMA ; National Key R&D program of China ; National Science Foundation of China ; Xiamen University ; JSPS
源URL[http://ir.xao.ac.cn/handle/45760611-7/8144]  
专题恒星形成与演化研究团组
通讯作者Feng, Siyi
作者单位1.INAF, Osservatorio Astrofisico Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
2.Xiamen Univ, Dept Astron, Zengcuoan West Rd, Xiamen 361005, Peoples R China
3.Univ Tokyo, Sch Sci, Dept Astron, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan
4.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
5.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
7.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Peoples R China
8.Shanghai Jiao Tong Univ, Dept Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
9.Guangxi Univ, Sch Phys Sci & Technol, Nanning 530004, Peoples R China
10.Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
推荐引用方式
GB/T 7714		 Lin, Shuting,Feng, Siyi,Sanhueza, Patricio,et al. The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow[J]. ASTROPHYSICAL JOURNAL,2025,990(2):229.
APA Lin, Shuting.,Feng, Siyi.,Sanhueza, Patricio.,Wang, Ke.,Zhang, Zhi-Yu.,...&Sabatini, Giovanni.(2025).The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow.ASTROPHYSICAL JOURNAL,990(2),229.
MLA Lin, Shuting,et al."The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow".ASTROPHYSICAL JOURNAL 990.2(2025):229.

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