Stages of Reionization as Revealed by the Minkowski Functionals
文献类型：期刊论文
| 作者 | Chen,Zhaoting1,2,3; Xu,Yidong1 ; Wang,Yougang1; Chen,Xuelei1,4,5
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-10-25 |
| 卷号 | 885期号:1 |
| 关键词 | Non-Gaussianity Large-scale structure of the universe Voids Reionization |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab43e6 |
| 英文摘要 | Abstract We study the evolution of the hydrogen ionization field during the epoch of reionization (EoR) using seminumerical simulations. By calculating the Minkowski functionals (MFs) of the 21 cm brightness temperature field, which provides a quantitative description of topology of the neutral and ionized regions, we find that the reionization process can be divided into five stages, each with different topological structures, corresponding to isolated ionized regions (“bubbles”); connected ionized regions (“ionized fibers”) that percolate through the cosmic volume; a sponge-like configuration with intertwined neutral and ionized regions after the overlap of bubbles; connected neutral regions (“neutral fibers”), when the ionized region begins to surround the remaining neutral region; and isolated neutral regions (“islands”), before the whole space is ionized except for the rare dense clumps in galaxies and minihalos and the reionization process is completed. We use the MFs and the size statistics on the ionized or neutral regions to distinguish these different stages and find the neutral fractions at which the transitions of the different stages occur. At the later stages of reionization the neutral regions are more isolated than the ionized regions; this is the motivation for the island model description of reionization. We compare the late-stage topological evolution in the island model and the bubble model, showing that in the island model the neutral fibers are more easily broken into multiple pieces owing to the ionizing background. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-885-1-AB43E6 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28437]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China xuyd@nao.cas.cn, xuelei@cosmology.bao.ac.cn 2.Department of Astronomy, University of Science and Technology of China, Hefei, People's Republic of China 3.Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 5.Center of High Energy Physics, Peking University, Beijing 100871, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Chen,Zhaoting,Xu,Yidong,Wang,Yougang,et al. Stages of Reionization as Revealed by the Minkowski Functionals[J]. The Astrophysical Journal,2019,885(1). |
| APA | Chen,Zhaoting,Xu,Yidong,Wang,Yougang,&Chen,Xuelei.(2019).Stages of Reionization as Revealed by the Minkowski Functionals.The Astrophysical Journal,885(1). |
| MLA | Chen,Zhaoting,et al."Stages of Reionization as Revealed by the Minkowski Functionals".The Astrophysical Journal 885.1(2019). |
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来源：国家天文台
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