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A FLUX-LIMITED SAMPLE OF z ∼ 1 Lyα EMITTING GALAXIES IN THE CHANDRA DEEP FIELD SOUTH
Ist Teil von
The Astrophysical journal, 2012-04, Vol.749 (2), p.1-13
Ort / Verlag
Bristol: IOP
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Free E-Journal (出版社公開部分のみ）
Beschreibungen/Notizen
We describe a method for obtaining a flux-limited sample of Ly alpha emitters from Galaxy Evolution Explorer (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 super(-15) erg cm super(-2) s super(-1). We use the UV spectra and the available X-ray data and optical spectra to estimate the fraction of active galactic nuclei in the selection. We report the first detection of a giant Ly alpha blob at z < 1, though we find that these objects are much less common at z = 1 than at z = 3. Finally, we compute limits on the z ~ 1 Ly alpha luminosity function and confirm that there is a dramatic evolution in the luminosity function over the redshift range z = 0-1.