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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, Jixing5,6; Mardones, Diego7; Liu, Tie8; Inostroza, Natalia1; Peng, Yaping2; He JH(何金华)3,4,7
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-10
卷号702
关键词ISM: abundances ISM: clouds evolution ISM: molecules
ISSN号0004-6361
DOI10.1051/0004-6361/202452590
产权排序第7完成单位
文献子类Article
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.
学科主题天文学 ; 恒星与银河系 ; 天体化学
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
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[2024] ; Natural Science Foundation of Xinjiang[2025D01D49] ; PCI-ANID International Networks Grant REDES[190113] ; FONDECYT[1241193] ; National Natural Science Foundation of China (NSFC)[12073061, 12122307] ; International partnership program of Chinese Academy of Sciences[114231KYSB20200009] ; Shanghai Pujiang Program[20PJ1415500] ; Chinese Academy of Sciences (CAS) ; ChinaChile Joint Research Fund[2211, E52H540201] ; Chinese Academy of Sciences South America Center for Astronomy (CASSACA) ; Chilean Astronomy Society (SOCHIAS) ; Tianchi Talent Program of Xinjiang Uygur Autonomous Region
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28653]  
专题云南天文台_其他
通讯作者Ge, Jixing
作者单位1.Universidad Autónoma de Chile, Facultad de Ingeniería, Núcleo de Astroquímica & Astrofísica,Av. Pedro de Valdivia 425, Providencia, Chile;
2.Department of Physics, Faculty of Science, Kunming University of Science and Technology, Kunming 650500, PR China;
3.Yunnan Observatories, Chinese Academy of Sciences,396 Yangfangwang, Guandu District, Kunming 650216, Yunnan, PR China;
4.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, PR China
5.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China;
6.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011, China;
7.Departamento de Astronomía, Universidad de Chile,Camino el Observatorio 1515, Las Condes, Santiago, Chile;
8.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, PR 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.
APA Ge, Jixing,Mardones, Diego,Liu, Tie,Inostroza, Natalia,Peng, Yaping,&何金华.(2025).The role of polycyclic aromatic hydrocarbons in astrochemical modeling at different evolutionary stages of cold dense cloud cores.ASTRONOMY & ASTROPHYSICS,702.
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).

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