The Metal-poor Metallicity Distribution of the Ancient Milky Way
文献类型：期刊论文
| 作者 | Chiti,Anirudh3; Mardini,Mohammad K.1,2; Frebel,Anna3; Daniel,Tatsuya4 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-04-01 |
| 卷号 | 911期号:2 |
| 关键词 | Population II stars Milky Way Galaxy |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/abd629 |
| 英文摘要 | Abstract We present a low-metallicity map of the Milky Way consisting of ～110,000 metal-poor giants with ?3.5 < [Fe/H] < ?0.75, based on public photometry from the second data release of the SkyMapper survey. These stars extend out to ～7 kpc from the solar neighborhood and cover the main Galactic stellar populations, including the thick disk and the inner halo. Notably, this map can reliably differentiate metallicities down to [Fe/H] ～ ?3.0, and thus provides an unprecedented view into the ancient, metal-poor Milky Way. Among the more metal-rich stars in our sample ([Fe/H] > ?2.0), we recover a clear spatial dependence of decreasing mean metallicity as a function of scale height that maps onto the thick disk component of the Milky Way. When only considering the very metal-poor stars in our sample ([Fe/H] < ?2), we recover no such spatial dependence in their mean metallicity out to a scale height of ∣Z∣ ～ 7 kpc. We find that the metallicity distribution function (MDF) of the most metal-poor stars in our sample (?3.0 < [Fe/H] < ?2.3) is well fit with an exponential profile with a slope of and [Fe/H] = 1.52 ± 0.05, and slightly shifts to after accounting for target selection effects. For [Fe/H] < ?2.3, the MDF is largely insensitive to scale height ∣Z∣ out to ～5 kpc, showing that very and extremely metal-poor stars are in every galactic component. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-911-2-ABD629 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/59572]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Chiti,Anirudh |
| 作者单位 | 1.Institute of Space Sciences, Shandong University, Weihai 264209, People’s Republic of China 2.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 3.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; achiti@mit.edu 4.Department of Physics, Brown University, Providence, RI 02912, USA |
| 推荐引用方式 GB/T 7714 | Chiti,Anirudh,Mardini,Mohammad K.,Frebel,Anna,et al. The Metal-poor Metallicity Distribution of the Ancient Milky Way[J]. The Astrophysical Journal Letters,2021,911(2). |
| APA | Chiti,Anirudh,Mardini,Mohammad K.,Frebel,Anna,&Daniel,Tatsuya.(2021).The Metal-poor Metallicity Distribution of the Ancient Milky Way.The Astrophysical Journal Letters,911(2). |
| MLA | Chiti,Anirudh,et al."The Metal-poor Metallicity Distribution of the Ancient Milky Way".The Astrophysical Journal Letters 911.2(2021). |
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来源：国家天文台
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