The Ly? 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; Felipe Barrientos, L.6; 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
Corresponding AuthorHu, Weida(
AbstractWe 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.
Keywordcosmology: observations dark ages first stars galaxies: formation galaxies: high-redshift reionization
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000498859100001
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Document Type期刊论文
Corresponding AuthorHu, Weida
Affiliation1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
5.Carnegie Inst Sci, Las Campanas Observ, Casilla 601, La Serena, Chile
6.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Santiago, Chile
7.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
8.European Southern Observ, Alonso Cordova 3107,Casilla 19001, Santiago, Chile
9.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
10.Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA
11.Natl Opt Astron Observ, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile
12.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
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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