The Ly? 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; Felipe Barrientos, L.7; Yang, Huan8; Jiang, Chunyan10; Kang, Wenyong11,12 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-12-01 |
| 卷号 | 886期号:2页码:21 |
| ISSN号 | 0004-637X |
| 关键词 | cosmology: observations dark ages first stars galaxies: formation galaxies: high-redshift reionization |
| DOI | 10.3847/1538-4357/ab4cf4 |
| 通讯作者 | Hu, Weida(urverda@mail.ustc.edu.cn) |
| 英文摘要 | We present the largest-ever sample of 79 Ly? 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 Ly? LF in COSMOS is confirmed with six (two newly selected) luminous LAEs (L-Ly? > 10(43.3) 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 x(H i)?0.2?0.4 is derived at z?7.0 based on the cosmic evolution of the Ly? LF. |
| WOS关键词 | ALPHA-EMITTING GALAXIES ; LARGE-SCALE STRUCTURES ; REDSHIFT Z ; DEEP SURVEY ; EMITTERS ; EMISSION ; SEXTRACTOR ; EVOLUTION ; DISCOVERY ; TOPOLOGY |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000498859100001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35117]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Hu, Weida |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Natl Opt Astron Observ, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile 3.Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA 4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 5.European Southern Observ, Alonso Cordova 3107,Casilla 19001, Santiago, Chile 6.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA 7.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Santiago, Chile 8.Carnegie Inst Sci, Las Campanas Observ, Casilla 601, La Serena, Chile 9.Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA 10.Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Weida,Wang, Junxian,Zheng, Zhen-Ya,et al. The Ly? Luminosity Function and Cosmic Reionization at z?7.0: A Tale of Two LAGER Fields[J]. ASTROPHYSICAL JOURNAL,2019,886(2):21. |
| APA | Hu, Weida.,Wang, Junxian.,Zheng, Zhen-Ya.,Malhotra, Sangeeta.,Rhoads, James E..,...&Zheng, XianZhong.(2019).The Ly? Luminosity Function and Cosmic Reionization at z?7.0: A Tale of Two LAGER Fields.ASTROPHYSICAL JOURNAL,886(2),21. |
| MLA | Hu, Weida,et al."The Ly? Luminosity Function and Cosmic Reionization at z?7.0: A Tale of Two LAGER Fields".ASTROPHYSICAL JOURNAL 886.2(2019):21. |
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来源：紫金山天文台
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