Effects of turbulent dust grain motion to interstellar chemistry
文献类型：期刊论文
| 作者 | Ge JX(葛继兴)1,2 ; He JH(何金华)1; Yan, H. R.3,4,5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-02-01 |
| 卷号 | 455期号:4页码:3570-3587 |
| ISSN号 | 0035-8711 |
| 关键词 | astrochemistry turbulence ISM: abundances ISM: clouds dust, extinction ISM: molecules |
| 通讯作者 | Ge, JX (reprint author), Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | Theoretical studies have revealed that dust grains are usually moving fast through the turbulent interstellar gas, which could have significant effects upon interstellar chemistry by modifying grain accretion. This effect is investigated in this work on the basis of numerical gas-grain chemical modelling. Major features of the grain motion effect in the typical environment of dark clouds (DC) can be summarized as follows: (1) decrease of gas-phase (both neutral and ionic) abundances and increase of surface abundances by up to 2-3 orders of magnitude; (2) shifts of the existing chemical jumps to earlier evolution ages for gas-phase species and to later ages for surface species by factors of about 10; (3) a few exceptional cases in which some species turn out to be insensitive to this effect and some other species can show opposite behaviours too. These effects usually begin to emerge from a typical DC model age of about 10(5) yr. The grain motion in a typical cold neutral medium (CNM) can help overcome the Coulomb repulsive barrier to enable effective accretion of cations on to positively charged grains. As a result, the grain motion greatly enhances the abundances of some gas-phase and surface species by factors up to 2-6 or more orders of magnitude in the CNM model. The grain motion effect in a typical molecular cloud (MC) is intermediate between that of the DC and CNM models, but with weaker strength. The grain motion is found to be important to consider in chemical simulations of typical interstellar medium. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RAY IONIZATION RATE ; POLYCYCLIC AROMATIC-HYDROCARBONS ; MONTE-CARLO-SIMULATION ; MOLECULAR CLOUDS ; SURFACE-CHEMISTRY ; CHEMICAL-MODELS ; MAGNETOHYDRODYNAMIC TURBULENCE ; CHARGE FLUCTUATIONS ; HYDROGEN MOLECULES ; INFRARED-EMISSION |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/455/4/3570 |
| 语种 | 英语 |
| WOS记录号 | WOS:000368009300013 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9397]  |
| 专题 | 云南天文台_大样本恒星演化研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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, PR China 2.University of the Chinese Academy of Science, Yuquan Road 19, Shijingshan Block, 100049, Beijing, PR China 3.The Kavli Institute for Astronomy and Astrophysics at Peking University, Beijing, PR China 4.DESY, Platanenallee 6, D-15738 Zeuthen, Germany 5.Institut für Physik & Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, D-14476 Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Ge JX,He JH,Yan, H. R.. Effects of turbulent dust grain motion to interstellar chemistry[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,455(4):3570-3587. |
| APA | Ge JX,He JH,&Yan, H. R..(2016).Effects of turbulent dust grain motion to interstellar chemistry.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,455(4),3570-3587. |
| MLA | Ge JX,et al."Effects of turbulent dust grain motion to interstellar chemistry".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 455.4(2016):3570-3587. |
入库方式： OAI收割
来源：云南天文台
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