Calculating the Excitation Temperature for H2CO Absorption Lines in Molecular Clouds
文献类型：期刊论文
| 作者 | Bu, Jia4,5 ; Esimbek, Jarken1,2,4,5; Zhou, Jianjun1,2,4,5; Komesh, Toktarkhan3,6; Tang, Xindi1,2,4,5; Li, Dalei1,2,4,5; He, Yuxin1,2,4,5; Tursun, Kadirya1,2,4,5; Zhou, Dongdong1,2,4,5; Imanaly, Ernar4,5
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2024-07-01 |
| 卷号 | 24期号:7页码:075022 |
| 关键词 | ISM: molecules (ISM:) HII regions ISM: clouds |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/ad5b36 |
| 产权排序 | 1 |
| 英文摘要 | The excitation temperature T-ex for molecular emission and absorption lines is an essential parameter for interpreting the molecular environment. This temperature can be obtained by observing multiple molecular transitions or hyperfine structures of a single transition, but it remains unknown for a single transition without hyperfine structure lines. Earlier H2CO absorption experiments for a single transition without hyperfine structures adopted a constant value of T-ex, which is not correct for molecular regions with active star formation and H ii regions. For H2CO, two equations with two unknowns may be used to determine the excitation temperature T-ex and the optical depth tau, if other parameters can be determined from measurements. Published observational data of the 4.83 GHz (lambda = 6 cm) H2CO (1(10)-1(11)) absorption line for three star formation regions, W40, M17 and DR17, have been used to verify this method. The distributions of T-ex in these sources are in good agreement with the contours of the H110 alpha emission of the H ii regions in M17 and DR17 and with the H2CO (1(10)-1(11)) absorption in W40. The distributions of T-ex in the three sources indicate that there can be significant variation in the excitation temperature across star formation and H ii regions and that the use of a fixed (low) value results in misinterpretation. |
| WOS关键词 | GALACTIC PLANE |
| 资助项目 | National Key R&D Program of China[2022YFA1603103] ; Regional Collaborative Innovation Project of Xinjiang Uyghur Autonomous Region[2022E01050] ; Tianshan Talent Program of Xinjiang Uygur Autonomous Region[2022TSYCLJ0005] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01E06] ; Chinese Academy of Sciences (CAS) Light of West China Program[xbzg-zdsys-202212] ; Chinese Academy of Sciences (CAS) Light of West China Program[2020-XBQNXZ-017] ; Chinese Academy of Sciences (CAS) Light of West China Program[2021- XBQNXZ-028] ; National Natural Science Foundation of China (NSFC)[12173075] ; National Natural Science Foundation of China (NSFC)[11973076] ; National Natural Science Foundation of China (NSFC)[12103082] ; Xinjiang Key Laboratory of Radio Astrophysics[2022D04033] ; Youth Innovation Promotion Association CAS ; Chinese Academy of Sciences Presidents International Fellowship Initiative[2022VMA0019] ; Chinese Academy of Sciences Presidents International Fellowship Initiative[2023VMA0030] ; Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan[AP13067768] ; Operation, Maintenance, and Upgrading Fund for Astronomical Telescopes and Facility Instruments, from the Ministry of Finance of China |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001269747800001 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| 资助机构 | National Key R&D Program of China ; Regional Collaborative Innovation Project of Xinjiang Uyghur Autonomous Region ; Tianshan Talent Program of Xinjiang Uygur Autonomous Region ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; Chinese Academy of Sciences (CAS) Light of West China Program ; National Natural Science Foundation of China (NSFC) ; Xinjiang Key Laboratory of Radio Astrophysics ; Youth Innovation Promotion Association CAS ; Chinese Academy of Sciences Presidents International Fellowship Initiative ; Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan ; Operation, Maintenance, and Upgrading Fund for Astronomical Telescopes and Facility Instruments, from the Ministry of Finance of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6861]  |
| 专题 | 恒星形成与演化研究团组 新疆天文台_射电天文研究室 |
| 通讯作者 | Bu, Jia; Esimbek, Jarken; Zhou, Jianjun |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China 2.Xinjiang Key Lab Radio Astrophys, Urumqi 830011, Peoples R China 3.Nazarbayev Univ, Energet Cosmos Lab, Astana 010000, Kazakhstan 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100080, Peoples R China 6.Al Farabi Kazakh Natl Univ, Inst Expt & Theoret Phys, Alma Ata 050040, Kazakhstan |
| 推荐引用方式 GB/T 7714 | Bu, Jia,Esimbek, Jarken,Zhou, Jianjun,et al. Calculating the Excitation Temperature for H2CO Absorption Lines in Molecular Clouds[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2024,24(7):075022. |
| APA | Bu, Jia.,Esimbek, Jarken.,Zhou, Jianjun.,Komesh, Toktarkhan.,Tang, Xindi.,...&Sailanbek, Serikbek.(2024).Calculating the Excitation Temperature for H2CO Absorption Lines in Molecular Clouds.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,24(7),075022. |
| MLA | Bu, Jia,et al."Calculating the Excitation Temperature for H2CO Absorption Lines in Molecular Clouds".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 24.7(2024):075022. |
入库方式： OAI收割
来源：新疆天文台
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