A Dense Molecular Ringlike Structure in Gaseous CO Depletion Region G34.74-0.12
文献类型：期刊论文
| 作者 | Lin, Shuting4; Feng, Siyi4; Xu, Fengwei2,3; Wang, Ke2,3; Sanhueza, Patricio1; Wang, Junzhi17; Zhang, Zhi-Yu15,16; Zhang, Yichen14; Morii, Kaho13; Liu, Hauyu Baobab11,12 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-10-10 |
| 卷号 | 992期号:1页码:L15 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ae0579 |
| 产权排序 | 15 |
| 英文摘要 | We report the discovery of a dense molecular ringlike structure in a dense (105 cm-3), cold (parsec-scale CO depletion at a factor of 5), and young (104 yr) star-forming region G34.74-0.12, revealed by C18O (2-1), HNC (1-0), and N2H+ (1-0) observations with the Atacama Large Millimeter/submillimeter Array. The ringlike structure is redshifted with respect to the clump, spanning from Vsys,lsr + 0.9 to Vsys,lsr + 2.9 km s-1, with a total mass of 109 M circle dot. It is spatially coincident with 1.3 and 3.0 mm dust continuum emission from the cores, and several protostellar outflows. However, no free-free emission or H ii region is detected in association with this structure. With a slow expansion speed indicated by the position-velocity diagram, this ring structure differs from rings previously identified in more evolved star-forming regions. Possible explanations for the ring-like structure include a relic windblown bubble produced by a deeply embedded young stellar object, a hollow cavity formed by cloud-cloud interactions, a gas ring resulting from a temperature gradient, or a line-of-sight superposition of multiple outflows or dense clouds. This discovery offers a rare observational glimpse into the earliest dynamical processes involved in massive star formation. |
| WOS关键词 | HIGH-MASS CLUMPS ; STAR-FORMING REGIONS ; CLOUD-CLOUD COLLISION ; ALMA SURVEY ; KINEMATIC DISTANCES ; CHEMICAL-STRUCTURE ; INFRARED BUBBLE ; GAS KINEMATICS ; I. ; EVOLUTION |
| 资助项目 | National Key R&D program of China[2025YFE0108200] ; National Key R&D program of China[2023YFB3002502] ; National Science Foundation of China[12373023] ; National Science Foundation of China[1213308] ; National Science Foundation of China[12033005] ; Xiamen University ; Tianchi Talent Program of Xinjiang Uygur Autonomous Region ; China-Chile Joint Research Fund (CCJRF)[2211] ; JSPS[JP22H01271] ; JSPS[JP23H01221] ; Project PRIN-MUR 2020 MUR BEYOND-2p (Astrochemistry beyond the second period elements)[2020AFB3FX] ; PRIN MUR 2022 FOSSILS[2022JC2Y93] ; Project ASI-Astrobiologia 2023 MIGLIORA (Modeling Chemical Complexity)[F83C23000800005] ; China Manned Space Program[C13C23000770005] ; INAF-GO 2023 funding PROTOSKA (Exploiting ALMA data to study planet forming disks: preparing the advent of SKA) ; INAF-Minigrant 2023 TRIESTE (TRacing the chemIcal hEritage of our originS: from proTostars to planEts) ; National Natural Science Foundation of China[12373006] ; National Natural Science Foundation of China[12533004] ; [CMS-CSST-2025-A10] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001590320400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Key R&D program of China ; National Science Foundation of China ; Xiamen University ; Tianchi Talent Program of Xinjiang Uygur Autonomous Region ; China-Chile Joint Research Fund (CCJRF) ; JSPS ; Project PRIN-MUR 2020 MUR BEYOND-2p (Astrochemistry beyond the second period elements) ; PRIN MUR 2022 FOSSILS ; Project ASI-Astrobiologia 2023 MIGLIORA (Modeling Chemical Complexity) ; China Manned Space Program ; INAF-GO 2023 funding PROTOSKA (Exploiting ALMA data to study planet forming disks: preparing the advent of SKA) ; INAF-Minigrant 2023 TRIESTE (TRacing the chemIcal hEritage of our originS: from proTostars to planEts) ; National Natural Science Foundation of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8211]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Feng, Siyi |
| 作者单位 | 1.Univ Tokyo, Sch Sci, Dept Astron, 7-3-1 Hongo,Bunkyo, Tokyo 1130033, Japan 2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 4.Xiamen Univ, Dept Astron, Zengcuoan West Rd, Xiamen 361005, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China 6.Netherlands Inst Radio Astron, ASTRON, NL-7991 PD Dwingeloo, Netherlands 7.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 8.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China 9.INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy 10.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1 Sec 4,Roosevelt Rd, Taipei 10617, Taiwan |
| 推荐引用方式 GB/T 7714 | Lin, Shuting,Feng, Siyi,Xu, Fengwei,et al. A Dense Molecular Ringlike Structure in Gaseous CO Depletion Region G34.74-0.12[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,992(1):L15. |
| APA | Lin, Shuting.,Feng, Siyi.,Xu, Fengwei.,Wang, Ke.,Sanhueza, Patricio.,...&Li, Shanghuo.(2025).A Dense Molecular Ringlike Structure in Gaseous CO Depletion Region G34.74-0.12.ASTROPHYSICAL JOURNAL LETTERS,992(1),L15. |
| MLA | Lin, Shuting,et al."A Dense Molecular Ringlike Structure in Gaseous CO Depletion Region G34.74-0.12".ASTROPHYSICAL JOURNAL LETTERS 992.1(2025):L15. |
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