The Lyα Luminosity Function and Cosmic Reionization at z?～?7.0: A Tale of Two LAGER Fields
文献类型：期刊论文
| 作者 | Hu,Weida11,12; Wang,Junxian11,12; Zheng,Zhen-Ya10; Malhotra,Sangeeta9; Rhoads,James E.9; Infante,Leopoldo8; Barrientos,L. Felipe7; Yang,Huan8; Jiang,Chunyan10; Kang,Wenyong11,12 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-11-25 |
| 卷号 | 886期号:2 |
| 关键词 | cosmology: observations dark ages first stars galaxies: formation galaxies: high-redshift reionization |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab4cf4 |
| 英文摘要 | Abstract We present the largest-ever sample of 79 Lyα emitters (LAEs) at z?～?7.0 selected in the COSMOS and CDFS fields of the LAGER project (the Lyman Alpha Galaxies in the Epoch of Reionization). Our newly amassed ultradeep narrowband exposure and deeper/wider broadband images have more than doubled the number of LAEs in COSMOS, and we have selected 30 LAEs in the second field CDFS. We detect two large-scale LAE-overdense regions in the COSMOS that are likely protoclusters at the highest redshift to date. We perform injection and recovery simulations to derive the sample incompleteness. We show that significant incompleteness comes from blending with foreground sources, which, however, has not been corrected in LAE luminosity functions (LFs) in the literature. The bright-end bump in the Lyα LF in COSMOS is confirmed with six (two newly selected) luminous LAEs (LLyα > 1043.3 erg s?1). Interestingly, the bump is absent in CDFS, in which only one luminous LAE is detected. Meanwhile, the faint-end LFs from the two fields agree well with each other. The six luminous LAEs in COSMOS coincide with two LAE-overdense regions, while such regions are not seen in CDFS. The bright-end LF bump could be attributed to ionized bubbles in a patchy reionization. It appears associated with cosmic overdensities and thus supports an inside-out reionization topology at z?～?7.0, i.e., the high-density peaks were ionized earlier compared to the voids. An average neutral hydrogen fraction of xH i?～?0.2–0.4 is derived at z?～?7.0 based on the cosmic evolution of the Lyα LF. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-886-2-ab4cf4 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35644]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China 2.Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile 3.National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, AZ 85719, USA 4.The Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, 100871, People's Republic of China 5.European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago, Chile 6.School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA 7.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Santiago, Chile; hyang@carnegiescience.edu 8.Las Campanas Observatory, Carnegie Institution of Washington, Casilla 601, La Serena, Chile; linfante@carnegiescience.edu, barrientos@astro.puc.cl 9.Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA; sangeeta.malhotra@nasa.gov, james.e.rhoads@nasa.gov 10.CAS Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Shanghai 200030, People's Republic of China zhengzy@shao.ac.cn |
| 推荐引用方式 GB/T 7714 | Hu,Weida,Wang,Junxian,Zheng,Zhen-Ya,等. The Lyα Luminosity Function and Cosmic Reionization at z?～?7.0: A Tale of Two LAGER Fields[J]. The Astrophysical Journal,2019,886(2). |
| APA | Hu,Weida.,Wang,Junxian.,Zheng,Zhen-Ya.,Malhotra,Sangeeta.,Rhoads,James E..,...&Zheng,XianZhong.(2019).The Lyα Luminosity Function and Cosmic Reionization at z?～?7.0: A Tale of Two LAGER Fields.The Astrophysical Journal,886(2). |
| MLA | Hu,Weida,et al."The Lyα Luminosity Function and Cosmic Reionization at z?～?7.0: A Tale of Two LAGER Fields".The Astrophysical Journal 886.2(2019). |
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