SIMBAD references

2022ApJ...926..230N - Astrophys. J., 926, 230-230 (2022/February-3)

The Magellan M2FS Spectroscopic Survey of High-z Galaxies: Lyα Emitters at z ≃ 6.6 and the Evolution of Lyα Luminosity Function over z ≃ 5.7-6.6.


Abstract (from CDS):

We present a sample of Lyα emitters (LAEs) at z ≃ 6.6 from our spectroscopic survey of high-redshift galaxies using the multi-object spectrograph M2FS on the Magellan Clay telescope. The sample consists of 36 LAEs selected by the narrowband (NB921) technique over nearly 2 deg2 in the sky. These galaxies generally have high Lyα luminosities spanning a range of ∼3 x 1042-7 x 1043 erg s–1, and include some of the most Lyα-luminous galaxies known at this redshift. They show a positive correlation between the Lyα line width and Lyα luminosity, similar to the relation previously found in z ≃ 5.7 LAEs. Based on the spectroscopic sample, we calculate a sophisticated sample completeness correction and derive the Lyα luminosity function (LF) at z ≃ 6.6. We detect a density bump at the bright end of the Lyα LF that is significantly above the best-fit Schechter function, suggesting that very luminous galaxies tend to reside in overdense regions that have formed large ionized bubbles around them. By comparing with the z ≃ 5.7 Lyα LF, we confirm that there is a rapid LF evolution at the faint end, but a lack of evolution at the bright end. The fraction of the neutral hydrogen in the intergalactic medium at z ≃ 6.6 estimated from such an evolution is about 0.3 ± 0.1, supporting a rapid and rather late process of cosmic reionization.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): High-redshift galaxies - Lyman-alpha galaxies - Luminosity function - Reionization

Nomenclature: Table 2: [NJZ2022] NN (Nos 1-36).

Simbad objects: 42

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