2020ApJ...895..132T -
Astrophys. J., 895, 132-132 (2020/June-1)
The ultraluminous Lyα luminosity function at z = 6.6.
TAYLOR A.J., BARGER A.J., COWIE L.L., HU E.M. and SONGAILA A.
Abstract (from CDS):
We present the luminosity function (LF) for ultraluminous Lyα emitting galaxies (LAEs) at z = 6.6. We define ultraluminous LAEs (ULLAEs) as galaxies with logL(Lyα)> 43.5 erg s–1. We select our main sample using the g', r', i', z', and NB921 observations of a wide-area (30 deg2) Hyper Suprime-Cam survey of the north ecliptic pole (NEP) field. We select candidates with g′ ,r′ ,i′ > 26, NB921 <= 23.5, and NB921-z′ ≤ 1.3. Using the DEIMOS spectrograph on Keck II, we confirm 9 of our 14 candidates as ULLAEs at z = 6.6 and the remaining 5 as an active galactic nucleus at z = 6.6, two [O III]λ5007 emitting galaxies at z = 0.84 and z = 0.85, and two nondetections. This emphasizes the need for full spectroscopic follow-up to determine accurate LFs. In constructing the ULLAE LF at z = 6.6, we combine our nine NEP ULLAEs with two previously discovered and confirmed ULLAEs in the COSMOS field: CR7 and COLA1. We apply rigorous corrections for incompleteness based on simulations. We compare our ULLAE LF at z = 6.6 with LFs at z = 5.7 and z = 6.6 from the literature. Our data reject some previous LF normalizations and power-law indices, but they are broadly consistent with others. Indeed, a comparative analysis of the different literature LFs suggests that no LF is fully consistent with any of the others, making it critical to determine the evolution from z = 5.7 to z = 6.6 using LFs constructed in exactly the same way at both redshifts.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Emission line galaxies - Lya galaxies - Observational cosmology - High-redshift galaxies
Nomenclature:
Table 2: [SHB2018] NEPLAN (Nos NEPLA6-NEPLA9) added, [TBC2020] OIII N=1.
Simbad objects:
17
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