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Effects of turbulent dust grain motion to interstellar chemistry
Ge JX(葛继兴)1,2; He JH(何金华)1; Yan, H. R.3,4,5; Ge, JX (reprint author), Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-02-01
卷号455期号:4页码:3570-3587
DOI10.1093/mnras/stv2560
产权排序第1完成单位
收录类别SCI
关键词Astrochemistry Turbulence Ism: Abundances Ism: Clouds Ism: Molecules Dust Extinction
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.
项目资助者NSFC(11173056 ; 11473006)
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2015-12-02
WOS记录号WOS:000368009300013
WOS研究方向Astronomy & Astrophysics
WOS类目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
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9397
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 (reprint author), Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan, Peoples R China.
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
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Ge JX,He JH,Yan, H. R.,et al. 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.,&Ge, JX .(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.
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