numericalsimulationofapossibleoriginofthepositiveradialmetallicitygradientofthethickdisk
文献类型：期刊论文
| 作者 | Rahimi Awat1; Carrell Kenneth1; Kawata Daisuke2 |
| 刊名 | researchinastronomyandastrophysics
 |
| 出版日期 | 2014 |
| 卷号 | 14期号:11页码:1406 |
| ISSN号 | 1674-4527 |
| 英文摘要 | We analyze the radial and vertical metallicity and alpha/Fe gradients of the disk stars of a disk galaxy simulated in a fully cosmological setting with the chemo-dynamical galaxy evolution code GCD+. We study how the radial abundance gradients vary as a function of height above the plane and find that the metallicity (alpha/Fe) gradient becomes more positive (negative) with increasing height, changing sign around 1.5 kpc above the plane. At the largest vertical height (2 2 kpc at the outer region, because of the lower gravitational restoring force of the disk, i.e. flaring. As a result, the fraction of younger stars with higher metallicity due to the age-metallicity relation becomes higher at the outer radii, which makes the median metallicity higher at the outer radii. Combining this result with the recently observed age-metallicity and age-velocity dispersion relation for the Milky Way thick disk stars suggested by Haywood et al., we argue that the observed (small) positive radial metallicity gradient at large heights of the Milky Way disk stars can be explained by flaring of the younger thick and/or thin disk stars. |
| 资助项目 | [National Astronomical Observatories, Chinese Academy of Sciences] ; [Chinese Academy of Sciences Fellowships for Young International Scientists] ; [National Natural Science Foundation of China (NSFC)] |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/51595]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.伦敦大学学院 |
| 推荐引用方式 GB/T 7714 | Rahimi Awat,Carrell Kenneth,Kawata Daisuke. numericalsimulationofapossibleoriginofthepositiveradialmetallicitygradientofthethickdisk[J]. researchinastronomyandastrophysics,2014,14(11):1406. |
| APA | Rahimi Awat,Carrell Kenneth,&Kawata Daisuke.(2014).numericalsimulationofapossibleoriginofthepositiveradialmetallicitygradientofthethickdisk.researchinastronomyandastrophysics,14(11),1406. |
| MLA | Rahimi Awat,et al."numericalsimulationofapossibleoriginofthepositiveradialmetallicitygradientofthethickdisk".researchinastronomyandastrophysics 14.11(2014):1406. |
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来源：国家天文台
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