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

Author:

Wold Isak G. B.ORCID,Malhotra SangeetaORCID,Rhoads JamesORCID,Wang JunxianORCID,Hu WeidaORCID,Perez Lucia A.ORCID,Zheng Zhen-YaORCID,Khostovan Ali Ahmad,Walker Alistair R.ORCID,Barrientos L. FelipeORCID,González-López JorgeORCID,Harish SantoshORCID,Infante LeopoldoORCID,Jiang ChunyanORCID,Pharo JohnORCID,Moya-Sierralta Cristóbal,Bauer Franz E.ORCID,Galaz GasparORCID,Valdes FranciscoORCID,Yang HuanORCID

Abstract

Abstract We present a new measurement of the Lyα 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 ∼ 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 × 106 Mpc3 is double that of the next largest z ∼ 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 Lyα emitter (LAEs) candidates, characterize our survey’s completeness and reliability, and compute Lyα 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 Lyα 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 ∼ 7 or with a volume-averaged neutral hydrogen fraction of x H I < 0.33 at 1σ.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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