The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS
文献类型：期刊论文
| 作者 | Chen, J. L.1; Zhang, J. S.1; Ge, J. X.2,5; Wang, Y. X.1; Yu, H. Z.4; Zou, Y. P.1; Yan, Y. T.3; Wang, X. Y.1; Wei, D. Y.1 |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2025-08-04 |
| 卷号 | 170期号:2页码:74 |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/addf35 |
| 产权排序 | 2 |
| 英文摘要 | Using the Institut de Radioastronomie Millm & eacute;trique 30 m telescope, we presented observations of N2H+ J = 1-0, CCS JN = 87-76 and 77-66 lines toward a large sample of ultracompact H II regions (UC H IIs). Among our 88 UC H IIs, 87 and 33 sources were detected in the N2H+ J = 1-0 and CCS JN = 87-76 lines, respectively. For the CCS 77-66 transition, we detected emission in 10 out of 82 targeted sources, all of which also exhibited emission in the CCS JN = 87-76 line. Physical parameters are derived for our detections, including the optical depth and excitation temperature of N2H+, the rotational temperature of CCS and the column density. Combining our results and previous observation results in different stages of high-mass star-forming regions (HMSFRs), we found that the column density ratio N(N2H+)/N(CCS) increases from high-mass starless cores through high-mass protostellar cores to UC H IIs. This implies that N(N2H+)/N(CCS) can trace the evolution process of HMSFRs. It was supported by our gas-grain chemical model, which shows that N(N2H+)/N(CCS) increases with the evolution age of HMSFRs. The temperature, density and chemical age were also constrained from our best-fit model at each stage. Thus, we propose N(N2H+)/N(CCS) as a reliable chemical clock of HMSFRs. |
| WOS关键词 | COMPACT HII-REGIONS ; H-II REGIONS ; COMPLEX ORGANIC-MOLECULES ; DENSE INTERSTELLAR CLOUDS ; NITROGEN ISOTOPE RATIOS ; INFRARED DARK CLOUDS ; GALACTIC PLANE ; TRIGONOMETRIC PARALLAXES ; PROTOSTELLAR CANDIDATES ; PHYSICAL-PROPERTIES |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12373021] ; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12041302] ; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[2024] ; Natural Science Foundation of China ; International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne ; China Scholarship Council (CSC)[FEUZ-2023-0019] ; China Scholarship Council (CSC)[042-15] ; Ministry of Science and Higher Education of the Russian Federation |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001523838900001 |
| 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 ; Natural Science Foundation of China ; International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne ; China Scholarship Council (CSC) ; Ministry of Science and Higher Education of the Russian Federation |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/7993]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Zhang, J. S. |
| 作者单位 | 1.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 3.Max Planck Inst Radioastron, Auf dem Hugel 69, D-53121 Heidelberg, Germany 4.Ural Fed Univ, 19 Mira St, Ekaterinburg 620002, Russia 5.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, J. L.,Zhang, J. S.,Ge, J. X.,et al. The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS[J]. ASTRONOMICAL JOURNAL,2025,170(2):74. |
| APA | Chen, J. L..,Zhang, J. S..,Ge, J. X..,Wang, Y. X..,Yu, H. Z..,...&Wei, D. Y..(2025).The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS.ASTRONOMICAL JOURNAL,170(2),74. |
| MLA | Chen, J. L.,et al."The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS".ASTRONOMICAL JOURNAL 170.2(2025):74. |
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