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Interstellar chemical differentiation across grain sizes
Ge JX(葛继兴)1,2; He JH(何金华)1,3; Li, Aigen4; Ge, JX
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-07-21
卷号460期号:1页码:L50-L54
DOI10.1093/mnrasl/slw058
产权排序第1完成单位
收录类别SCI
关键词Astrochemistry Ism: Abundances Ism: Clouds Dust Extinction
摘要In this work, we investigate the effects of ion accretion and size-dependent dust temperatures on the abundances of both gas-phase and grain-surface species. While past work has assumed a constant areal density for icy species, we show that this assumption is invalid and the chemical differentiation over grain sizes is significant. We use a gas-grain chemical code to demonstrate this numerically for two typical interstellar conditions: a dark cloud (DC) and a cold neutral medium (CNM). It is shown that, although the grain-size distribution variation (but with the total grain surface area unchanged) has little effect on the gas-phase abundances, it can alter the abundances of some surface species by up to similar to 2-4 orders of magnitude. The areal densities of ice species are larger on smaller grains in the DC model as a consequence of ion accretion. However, the surface areal density evolution tracks are more complex in the CNM model due to the combined effects of ion accretion and dust temperature variation. The surface areal density differences between the smallest (similar to 0.01 mu m) and the biggest (similar to 0.2 mu m) grains can reach similar to 1 and similar to 5 orders of magnitude in the DC and CNM models, respectively.
项目资助者National Natural Science Foundation of China (NSFC)(11173056) ; academic leader talent plan of Guan-du district of Kunming ; National Science Foundation (NSF)(AST-1311804, NNX13AE63G)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2016-12-30
WOS记录号WOS:000379832000011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MONTE-CARLO TREATMENT ; RATE-EQUATIONS ; ICE MANTLES ; GAS ; CHEMISTRY ; SIMULATIONS ; MODEL ; DUST ; CLOUDS ; DISTRIBUTIONS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9619
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Ge, JX
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, PO Box 110, Kunming, 650011, Yunnan Province, China
2.University of the Chinese Academy of Sciences, Yuquan Road 19, Shijingshan Block, 100049, Beijing, China
3.Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) at Cerro Calán, Camino El Observatorio 1515, Las Condes, Santiago, Chile
4.Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
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Ge JX,He JH,Li, Aigen,et al. Interstellar chemical differentiation across grain sizes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):L50-L54.
APA Ge JX,He JH,Li, Aigen,&Ge, JX.(2016).Interstellar chemical differentiation across grain sizes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(1),L50-L54.
MLA Ge JX,et al."Interstellar chemical differentiation across grain sizes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.1(2016):L50-L54.
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