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Gas-grain modeling of interstellar O-2(dagger)
Zhang, Xia1,2; Quan, Donghui1,3; Esimbek, Jarken1,4
2020-02-01
Source PublicationCHINESE JOURNAL OF CHEMICAL PHYSICS
ISSN1674-0068
Volume33Issue:1Pages:107-113
Corresponding AuthorQuan, Donghui(quandh@xao.ac.cn)
AbstractMolecular 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.
KeywordAstrochemistry Models Interstellar medium Molecules Abundances
DOI10.1063/1674-0068/cjcp1911206
WOS KeywordMOLECULAR-OXYGEN ; DISSOCIATIVE RECOMBINATION ; CHEMICAL-MODELS ; O-2 ; ABUNDANCE ; WATER ; H3O+ ; CLOUDS ; ICE ; TEMPERATURES
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS IDWOS:000521229200018
PublisherCHINESE PHYSICAL SOC
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35881
Collection中国科学院紫金山天文台
Corresponding AuthorQuan, Donghui
Affiliation1.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
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.
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