ALMA observations of CH3COCH3 and the related species CH3CHO, CH3OH, and C2H5CN in line-rich molecular cores
文献类型：期刊论文
| 作者 | Li, Chuanshou6; Qin, Sheng-Li6; Liu, Tie1; Liu, Xunchuan1; Li, Xiaohu5 ; Chen, Li6; Liu, Hong-Li6; Xu, Fengwei2,4; Liu, Meizhu3; Tang, Mengyao9
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2025-03-28 |
| 卷号 | 696页码:A7 |
| 关键词 | astrochemistry line: identification stars: formation ISM: abundances ISM: molecules |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202452810 |
| 产权排序 | 3 |
| 英文摘要 | Context. Acetone (CH3COCH3) is a carbonyl-bearing complex organic molecule, yet interstellar observations of acetone remain limited. Studying the formation and distribution of CH3COCH3 in the interstellar medium can provide valuable insights into prebiotic chemistry and the evolution of interstellar molecules. Aims. We explore the spatial distribution of CH3COCH3 and its correlation with the O-bearing molecules acetaldehyde (CH3CHO) and methanol (CH3OH), as well as the N-bearing molecule ethyl cyanide (C2H5CN), in massive protostellar clumps. Methods. We observed 11 massive protostellar clumps using ALMA at 345 GHz, with an angular resolution of 0.7 ''-1.0 ''. Spectral line transitions were identified using the eXtended CASA Line Analysis Software Suite. We constructed integrated intensity maps of CH3COCH3, CH3CHO, CH3OH, and C2H5CN and derived their rotation temperatures, column densities, and abundances under the assumption of local thermodynamic equilibrium. Results. CH3COCH3 is detected in 16 line-rich cores from 9 massive protostellar clumps: 12 high-mass cores (core mass >8 M-circle dot), 3 intermediate-mass cores (2-8 M-circle dot), and 1 low-mass core (<2 M-circle dot). CH3CHO and CH3OH are also detected in all 16 cores, while C2H5CN is detected in 15. The integrated intensity maps reveal similar spatial distributions for CH3COCH3, CH3CHO, CH3OH, and C2H5CN. The line emission peaks of all four molecules coincide with the continuum emission peaks in regions without ultra-compact HII regions. Significant correlations are observed in the abundances of these molecules, which also exhibit similar average temperatures. Conclusions. Our observational results, supported by chemical models, suggest that CH3COCH3, CH3CHO, and CH3OH originate from the same gas. The observed temperatures and abundances of CH3COCH3 are consistent with model predictions involving grain surface chemistry. |
| WOS关键词 | COMPLEX ORGANIC-MOLECULES ; STAR-FORMING REGIONS ; 3-MILLIMETER OBSERVATIONS ; INTERSTELLAR ACETONE ; MASS PROTOSTARS ; HOT CORINO ; N-BEARING ; CHEMISTRY ; SEARCH ; MILLIMETER |
| 资助项目 | National Key R&D Program of China ; NSFC[12073061] ; NSFC[12122307] ; NSFC[12103045] ; NSFC[12473025] ; Xinjiang Uygur Autonomous Region of China ; Yunnan Fundamental Research Project[202301AT070118] ; Yunnan Fundamental Research Project[202401AS070121] ; International partnership program of Chinese Academy of Sciences[114231KYSB20200009] ; International partnership program of Chinese Academy of Sciences[20PJ1415500] ; Deutsche Forschungsgemeinschaft (DFG)[956] ; [2022YFA1603101] ; [12033005] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001455406500006 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Key R&D Program of China ; NSFC ; Xinjiang Uygur Autonomous Region of China ; Yunnan Fundamental Research Project ; International partnership program of Chinese Academy of Sciences ; Deutsche Forschungsgemeinschaft (DFG) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/7560]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Li, Chuanshou; Qin, Sheng-Li; Liu, Tie |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 3.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China 4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 5.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 831399, Peoples R China 6.Yunnan Univ, Sch Phys & Astron, Kunming 650091, Peoples R China 7.Res Ctr Intelligent Comp Platforms, Zhejiang Lab, Hangzhou 311100, Peoples R China 8.Univ Cologne, I Phys Inst, Zulpicher Str 77, D-50937 Cologne, Germany 9.Chuxiong Normal Univ, Inst Astrophys, Sch Phys & Elect Sci, Chuxiong 675000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Chuanshou,Qin, Sheng-Li,Liu, Tie,et al. ALMA observations of CH3COCH3 and the related species CH3CHO, CH3OH, and C2H5CN in line-rich molecular cores[J]. ASTRONOMY & ASTROPHYSICS,2025,696:A7. |
| APA | Li, Chuanshou.,Qin, Sheng-Li.,Liu, Tie.,Liu, Xunchuan.,Li, Xiaohu.,...&Wu, Yuefang.(2025).ALMA observations of CH3COCH3 and the related species CH3CHO, CH3OH, and C2H5CN in line-rich molecular cores.ASTRONOMY & ASTROPHYSICS,696,A7. |
| MLA | Li, Chuanshou,et al."ALMA observations of CH3COCH3 and the related species CH3CHO, CH3OH, and C2H5CN in line-rich molecular cores".ASTRONOMY & ASTROPHYSICS 696(2025):A7. |
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来源：新疆天文台
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