A Flux-Limited Sample of z~1 Ly-alpha Emitting Galaxies in the CDFS
A. J. Barger, L. L. Cowie, I. G. B. Wold

TL;DR
This paper presents a new method for creating a flux-limited sample of Ly-alpha emitting galaxies at z~1 using GALEX grism data, enabling better understanding of galaxy evolution.
Contribution
The authors develop a novel 3D data cube technique to identify Ly-alpha emitters in GALEX data, expanding the sample beyond pipeline detections and analyzing their properties.
Findings
Identified 28 Ly-alpha emitters in the Chandra Deep Field South.
Achieved 80% completeness for Ly-alpha fluxes above 10^-15 erg/cm^2/s.
Detected a giant Ly-alpha blob at z<1, less common than at z=3.
Abstract
We describe a method for obtaining a flux-limited sample of Ly-alpha emitters from GALEX grism data. We show that the multiple GALEX grism images can be converted into a three-dimensional (two spatial axes and one wavelength axis) data cube. The wavelength slices may then be treated as narrowband images and searched for emission-line galaxies. For the GALEX NUV grism data, the method provides a Ly-alpha flux-limited sample over the redshift range z=0.67-1.16. We test the method on the Chandra Deep Field South field, where we find 28 Ly-alpha emitters with faint continuum magnitudes (NUV>22) that are not present in the GALEX pipeline sample. We measure the completeness by adding artificial emitters and measuring the fraction recovered. We find that we have an 80% completeness above a Ly-alpha flux of 10^-15 erg/cm^2/s. We use the UV spectra and the available X-ray data and optical…
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