LAGER Lyα Luminosity Function at z ∼ 7: Implications for Reionization

被引：53

作者：

Wold, Isak G. B. ^{[1
]}

Malhotra, Sangeeta ^{[1
]}

Rhoads, James ^{[1
]}

Wang, Junxian ^{[2
,3
]}

Hu, Weida ^{[2
,3
]}

Perez, Lucia A. ^{[4
]}

Zheng, Zhen-Ya ^{[5
]}

Khostovan, Ali Ahmad ^{[1
]}

Walker, Alistair R. ^{[6
]}

Felipe Barrientos, L. ^{[7
,8
]}

Gonzalez-Lopez, Jorge ^{[7
,8
,9
]}

Harish, Santosh ^{[4
]}

Infante, Leopoldo ^{[10
]}

Jiang, Chunyan ^{[5
]}

Pharo, John ^{[4
]}

Moya-Sierralta, Cristobal ^{[7
,8
]}

Bauer, Franz E. ^{[7
,8
,11
,12
]}

Galaz, Gaspar ^{[7
,8
]}

Valdes, Francisco ^{[13
]}

Yang, Huan ^{[10
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

[2] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

[4] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[5] Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

[6] NSFs NOIRLab, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile

[7] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile

[8] Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile

[9] Univ Diego Portales, Nude Astron, Fac Ingn & Ciencias, Av Ejercito Libertador 441, Santiago, Chile

[10] Carnegie Inst Washington, Las Campanas Observ, Casilla 601, La Serena, Chile

[11] Millennium Inst Astrophys, Nuncio Monsefior Sotero Sanz 100,104, Santiago, Chile

[12] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA

[13] Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 927卷 / 01期

基金：

美国国家科学基金会; 日本学术振兴会; 日本科学技术振兴机构; 美国国家航空航天局; 英国科学技术设施理事会;

关键词：

HUBBLE DEEP FIELD; EMITTING GALAXIES; COSMIC REIONIZATION; SPECTROSCOPIC CONFIRMATION; LYMAN BREAK; REDSHIFT; EVOLUTION; EMITTERS; EPOCH; CONSTRAINTS;

D O I：

10.3847/1538-4357/ac4997

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new measurement of the Ly alpha luminosity function (LF) at redshift z = 6.9, finding moderate evolution from z = 5.7 that is consistent with a fully or largely ionized z similar to 7 intergalactic medium. Our result is based on four fields of the LAGER (Lyman Alpha Galaxies in the Epoch of Reionization) project. Our survey volume of 6.1 x 10(6) Mpc(3) is double that of the next largest z similar to 7 survey. We combine two new LAGER fields (WIDE12 and GAMA15A) with two previously reported LAGER fields (COSMOS and CDFS). In the new fields, we identify N = 95 new z = 6.9 Ly alpha emitter (LAEs) candidates, characterize our survey's completeness and reliability, and compute Ly alpha LFs. The best-fit Schechter LF parameters for all four LAGER fields are in good general agreement. Two fields (COSMOS and WIDE12) show evidence for a bright-end excess above the Schechter function fit. We find that the Ly alpha luminosity density declines at the same rate as the UV continuum LF from z = 5.7 to 6.9. This is consistent with an intergalactic medium that was fully ionized as early as redshift z similar to 7 or with a volume-averaged neutral hydrogen fraction of x (H I) < 0.33 at 1 sigma.

引用

页数：15

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