The Lyα Luminosity Function and Cosmic Reionization at z?~?7.0: A Tale of Two LAGER Fields
Hu,Weida1,2; Wang,Junxian1,2; Zheng,Zhen-Ya3; Malhotra,Sangeeta4; Rhoads,James E.4; Infante,Leopoldo5; Barrientos,L. Felipe6; Yang,Huan5; Jiang,Chunyan3; Kang,Wenyong1,2; Perez,Lucia A.7; Wold,Isak4; Hibon,Pascale8; Jiang,Linhua9; Khostovan,Ali Ahmad4; Valdes,Francisco10; Walker,Alistair R.11; Galaz,Gaspar6; Coughlin,Alicia7; Harish,Santosh7; Kong,Xu1,2; Pharo,John7; Zheng,XianZhong12
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
Keywordcosmology: observations dark ages first stars galaxies: formation galaxies: high-redshift reionization
WOS IDIOP:0004-637X-886-2-ab4cf4
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;,
2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
3.CAS Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Shanghai 200030, People's Republic of China
4.Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA;,
5.Las Campanas Observatory, Carnegie Institution of Washington, Casilla 601, La Serena, Chile;,
6.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Santiago, Chile;
7.School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA
8.European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago, Chile
9.The Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, 100871, People's Republic of China
10.National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, AZ 85719, USA
11.Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile
12.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
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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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