An Atlas of z=5.7 and z=6.5 Ly alpha Emitters
E. M. Hu, L. L. Cowie, A. J. Barger, P. Capak, Y. Kakazu, L., Trouille

TL;DR
This paper presents a comprehensive atlas of Ly alpha emitters at redshifts 5.7 and 6.5, analyzing their spectral profiles, line widths, and luminosity functions to understand galaxy evolution during this epoch.
Contribution
It provides the first uniform, wide-field spectroscopic survey of Ly alpha emitters at these redshifts, revealing similarities in spectral profiles and a decline in number density over time.
Findings
Spectral profiles are similar at z=5.7 and z=6.5.
Line widths are marginally narrower at higher redshift.
Number density of bright Ly alpha emitters decreases by a factor of 2 from z=5.7 to z=6.5.
Abstract
We present an atlas of 88 z~5.7 and 30 z~6.5 Ly alpha emitters obtained from a wide-field narrowband survey. We combined deep narrowband imaging in 120A bandpass filters centered at 8150A and 9140A with deep BVRIz broadband imaging to select high-redshift galaxy candidates over an area of 4180 square arcmin. The goal was to obtain a uniform selection of comparable depth over the 7 targeted fields in the two filters. For the GOODS-N region of the HDF-N field, we also selected candidates using a 120A filter centered at 9210A. We made spectroscopic observations with Keck DEIMOS of nearly all the candidates to obtain the final sample of Ly alpha emitters. At the 3.3A resolution of the DEIMOS observations the asymmetric profile for Ly alpha emission with its steep blue fall-off can be clearly seen in the spectra of nearly all the galaxies. We show that the spectral profiles are surprisingly…
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