Institutional Repository of Radio Astronomy Research Laboratory
| Gas-grain modeling of interstellar O-2(dagger) | |
Zhang, Xia1,2 ; Quan, Donghui1,3; Esimbek, Jarken1,4
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| 2020-02-01 | |
| Source Publication | CHINESE JOURNAL OF CHEMICAL PHYSICS
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| ISSN | 1674-0068 |
| Volume | 33Issue:1Pages:107-113 |
| Contribution Rank | 1 |
| Abstract | Molecular oxygen (O-2) is essential to human beings on the earth. Although elemental oxygen is rather abundant, O-2 is rare in the interstellar medium. It was only detected in two galactic and one extra-galactic region. The inconsistency between observations and theoretical studies is a big challenge for astrochemical models. Here we report a two-phase modeling research of molecular oxygen, using the Nautilus gas-grain code. We apply the isothermal cold dense models in the interstellar medium with two typical sets of initial elemental abundances, as well as the warm-up models with various physical conditions. Under cold dense conditions, we find that the timescales for gas-phase CO, O-2 and H2O to reach peak values are dependent on the hydrogen density and are shortened when hydrogen density increases. In warm-up models, O-2 abundances are in good agreement with observations at temperatures rising after 10(5) yr. In both isothermal and warm-up models, the steady-state O-2 fractional abundance is independent of the hydrogen density, as long as the temperature is high enough (>30 K), at which O-2 is prevented from significant depleting onto grain surface. In addition, low density is preferable for the formation of O-2, whether molecular oxygen is under cold conditions or in warm regions. |
| Keyword | Astrochemistry Models Interstellar medium Molecules Abundances |
| DOI | 10.1063/1674-0068/cjcp1911206 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | MOLECULAR-OXYGEN ; DISSOCIATIVE RECOMBINATION ; CHEMICAL-MODELS ; O-2 ; ABUNDANCE ; WATER ; H3O+ ; CLOUDS ; ICE ; TEMPERATURES |
| Funding Project | National Natural Science Foundation of China[11973075] ; National Natural Science Foundation of China[11433008] |
| WOS Research Area | Physics |
| WOS Subject | Physics, Atomic, Molecular & Chemical |
| WOS ID | WOS:000521229200018 |
| Publisher | CHINESE PHYSICAL SOC |
| Funding Organization | National Natural Science Foundation of China |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/3435 |
| Collection | 射电天文研究室_天体化学研究团组 |
| Corresponding Author | Quan, Donghui |
| Affiliation | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Eastern Kentucky Univ, Dept Chem, Richmond, KY 40475 USA 4.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Corresponding Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Zhang, Xia,Quan, Donghui,Esimbek, Jarken. Gas-grain modeling of interstellar O-2(dagger)[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2020,33(1):107-113. |
| APA | Zhang, Xia,Quan, Donghui,&Esimbek, Jarken.(2020).Gas-grain modeling of interstellar O-2(dagger).CHINESE JOURNAL OF CHEMICAL PHYSICS,33(1),107-113. |
| MLA | Zhang, Xia,et al."Gas-grain modeling of interstellar O-2(dagger)".CHINESE JOURNAL OF CHEMICAL PHYSICS 33.1(2020):107-113. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Zhang-2020-Gas-grain（558KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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