Interstellar chemical differentiation across grain sizes
文献类型：期刊论文
| 作者 | Ge JX(葛继兴)1,2 ; He JH(何金华)1,3; Li, Aigen4
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2016-07-21 |
| 卷号 | 460期号:1页码:L50-L54 |
| ISSN号 | 0035-8711 |
| 关键词 | astrochemistry ISM: abundances ISM: clouds dust, extinction |
| 通讯作者 | Ge, JX |
| 产权排序 | 第一完成单位 |
| 英文摘要 | 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. |
| 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] | MONTE-CARLO TREATMENT ; RATE-EQUATIONS ; ICE MANTLES ; GAS ; CHEMISTRY ; SIMULATIONS ; MODEL ; DUST ; CLOUDS ; DISTRIBUTIONS |
| 收录类别 | SCI |
| 原文出处 | http://mnrasl.oxfordjournals.org/content/460/1/L50 |
| 语种 | 英语 |
| WOS记录号 | WOS:000379832000011 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9619]  |
| 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, 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 |
| 推荐引用方式 GB/T 7714 | Ge JX,He JH,Li, Aigen. 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.(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. |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。