A Spectroscopic Survey of Lyα Emitters at z ≈ 3.1 over ∼1.2 Deg(2)
AffiliationUniv Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationYucheng Guo et al 2020 ApJ 902 137
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AbstractWe present a spectroscopic survey of Ly alpha emitters (LAEs) atz 3.1 in the Subaru XMM-Newton Deep Survey Field. This field has deep imaging data in a series of broad and narrow bands, including two adjacent narrow bands NB497 and NB503 that have allowed us to efficiently select LAE candidates atz 3.1. Using spectroscopic observations on MMT Hectospec and Magellan M2FS, we obtained a sample of 166 LAEs atz 3.1 over an effective area of similar to 1.2 deg(2), including 16 previously known LAEs. This is so far the largest (spectroscopically confirmed) sample of LAEs at this redshift. We make use of the secure redshifts and multiband data to measure spectral properties such as Ly alpha luminosity and rest-frame UV slope. We derive a robust Ly alpha luminosity function (LF) that spans a luminosity range from similar to 10(42.0)to >10(43.5)erg s(-1). Significant overdense and underdense regions are detected in our sample, but the area coverage is wide enough to largely suppress the effect from such cosmic variance. Our Ly alpha LF is generally consistent with those from previous studies atz similar to 3.1. At the brightest end of the LF, there is a tentative detection of a density excess that is not well described by the Schechter function. The comparison with the LFs at other redshifts suggests that the Ly alpha LF does not show significant evolution at 2 z < 5. Finally, we build the composite spectra of the LAEs and detect the Nv lambda 1239 and Civ lambda lambda 1548,1551 doublet emission lines at significance of similar to 4 sigma, suggesting very hard radiation fields in (some of) these LAEs.
VersionFinal published version
SponsorsNational Natural Science Foundation of China