Gas-grain modeling of interstellar O-2(dagger)

doi:10.1063/1674-0068/cjcp1911206

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	Gas-grain modeling of interstellar O-2(dagger)
	Zhang, Xia 1,2; Quan, Donghui 1,3; Esimbek, Jarken 1,4
刊名	CHINESE JOURNAL OF CHEMICAL PHYSICS
	2020-02-01
卷号	33 期号:1 页码:107-113
关键词	Astrochemistry Models Interstellar medium Molecules Abundances
ISSN号	1674-0068
DOI	10.1063/1674-0068/cjcp1911206
产权排序	1
英文摘要	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.
资助项目	National Natural Science Foundation of China[11973075] ; National Natural Science Foundation of China[11433008]
WOS关键词	MOLECULAR-OXYGEN ; DISSOCIATIVE RECOMBINATION ; CHEMICAL-MODELS ; O-2 ; ABUNDANCE ; WATER ; H3O+ ; CLOUDS ; ICE ; TEMPERATURES
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000521229200018
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3434]
专题	天体化学研究团组
通讯作者	Quan, Donghui
作者单位	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
推荐引用方式 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.