The role of polycyclic aromatic hydrocarbons in astrochemical modeling at different evolutionary stages of cold dense cloud cores
文献类型：期刊论文
| 作者 | Ge, Jixing1,8; Mardones, Diego2; Liu, Tie3; Inostroza-Pino, Natalia4; Peng, Yaping5; He, Jinhua2,6,7 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2025-10-01 |
| 卷号 | 702页码:14 |
| 关键词 | ISM: abundances ISM: clouds evolution ISM: molecules |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202452590 |
| 通讯作者 | Ge, Jixing(gejixing@xao.ac.cn) |
| 英文摘要 | Context. Although the role of PAHs have been highlighted in recent years, it is crucial to verify their functions at different evolutionary stages of dark cloud cores. Aims. Fitting molecular abundances with gas-grain chemical models has revealed shorter chemical ages for denser cold dark cloud cores. To deepen the understanding of chemical ages and the functions of PAHs, we investigated the influence of PAHs in our chemical models by fitting observational data. Methods. We collected observed molecular abundances (at least five species per core) from the literature for 39 cold dense cloud cores (T < 25 K and 10(4) <= n(H) <= 10(7) cm(-3)). Using a gas-grain chemical model, we fit the molecular abundances of the 39 samples to determine the best-fit chemical ages and discuss the role of PAHs in an evolutionary view. Results. We find an anticorrelation between the gas density and the fit chemical age through molecular abundance fitting. The best-fit chemical ages of the low-density cores (<7 x 10(4) cm(-3)) are comparable to the dynamical ages, which can be a good alternative indicator of physical age. However, for high-density cores (>7 x 10(4) cm(-3)), the chemical age is far from the physical age and therefore useless. The inclusion of PAHs do not change the estimation of the chemical ages much, which indicates the small effect of PAHs on average. However, we identified molecular tracers that are sensitive to PAHs at different evolutionary stages, thus revealing their diagnostic potential for chemical evolution. |
| WOS关键词 | GRAIN CHEMICAL-MODELS ; PRE-STELLAR CORES ; PRESTELLAR CORES ; INTERSTELLAR CLOUDS ; STARLESS CORES ; INTERNAL STRUCTURE ; CHEMISTRY ; GAS ; L1498 ; TEMPERATURE |
| 资助项目 | Xinjiang Tianchi Talent Program[2024] ; Natural Science Foundation of Xinjiang[2025D01D49] ; PCI-ANID International Networks Grant REDES[190113] ; FONDECYT[1241193] ; National Natural Science Foundation of China (NSFC)[12073061] ; National Natural Science Foundation of China (NSFC)[12122307] ; International partnership program of Chinese Academy of Sciences[114231KYSB20200009] ; Shanghai Pujiang Program[20PJ1415500] ; Chinese Academy of Sciences (CAS) ; ChinaChile Joint Research Fund[2211] ; ChinaChile Joint Research Fund[E52H540201] ; Chinese Academy of Sciences South America Center for Astronomy (CASSACA) ; Chilean Astronomy Society (SOCHIAS) ; Tianchi Talent Program of Xinjiang Uygur Autonomous Region |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001596517000001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | Xinjiang Tianchi Talent Program ; Natural Science Foundation of Xinjiang ; PCI-ANID International Networks Grant REDES ; FONDECYT ; National Natural Science Foundation of China (NSFC) ; International partnership program of Chinese Academy of Sciences ; Shanghai Pujiang Program ; Chinese Academy of Sciences (CAS) ; ChinaChile Joint Research Fund ; Chinese Academy of Sciences South America Center for Astronomy (CASSACA) ; Chilean Astronomy Society (SOCHIAS) ; Tianchi Talent Program of Xinjiang Uygur Autonomous Region |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8265]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Ge, Jixing |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Univ Chile, Dept Astron, Camino Observ 1515, Santiago, Chile 3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Univ Autonoma Chile, Fac Ingn Nucleo Astroquim & Astrofis, Av Pedro de Valdivia 425, Providencia, Chile 5.Kunming Univ Sci & Technol, Fac Sci, Dept Phys, Kunming 650500, Peoples R China 6.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China 7.Chinese Acad Sci, CAS, South Amer Ctr Astron, Natl Astron Observ, Beijing 100101, Peoples R China 8.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ge, Jixing,Mardones, Diego,Liu, Tie,et al. The role of polycyclic aromatic hydrocarbons in astrochemical modeling at different evolutionary stages of cold dense cloud cores[J]. ASTRONOMY & ASTROPHYSICS,2025,702:14. |
| APA | Ge, Jixing,Mardones, Diego,Liu, Tie,Inostroza-Pino, Natalia,Peng, Yaping,&He, Jinhua.(2025).The role of polycyclic aromatic hydrocarbons in astrochemical modeling at different evolutionary stages of cold dense cloud cores.ASTRONOMY & ASTROPHYSICS,702,14. |
| MLA | Ge, Jixing,et al."The role of polycyclic aromatic hydrocarbons in astrochemical modeling at different evolutionary stages of cold dense cloud cores".ASTRONOMY & ASTROPHYSICS 702(2025):14. |
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