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20 April 2024 |
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A Faint Flux-Limited Lyman Alpha Emitter Sample at $zsim0.3$ | | Isak G. B. Wold
; Steven L. Finkelstein
; Amy J. Barger
; Lennox L. Cowie
; Benjamin Rosenwasser
; | | Date: |
18 Sep 2017 | | Abstract: | We present a flux-limited sample of $zsim0.3$ Ly$alpha$ emitters (LAEs)
from Galaxy Evolution Explorer (GALEX) grism spectroscopic data. The published
GALEX $zsim0.3$ LAE sample is pre-selected from continuum-bright objects and
thus is biased against high equivalent width (EW) LAEs. We remove this
continuum pre-selection and compute the EW distribution and the luminosity
function of the Ly$alpha$ emission line directly from our sample. We examine
the evolution of these quantities from $zsim0.3$ to $2.2$ and find that the EW
distribution shows little evidence for evolution over this redshift range. As
shown by previous studies, the Ly$alpha$ luminosity density from star-forming
galaxies declines rapidly with declining redshift. However, we find that the
decline in Ly$alpha$ luminosity density from $z=2.2$ to $z=0.3$ may simply
mirror the decline seen in the H$alpha$ luminosity density from $z=2.2$ to
$z=0.4$, implying little change in the volumetric Ly$alpha$ escape fraction.
Finally, we show that the observed Ly$alpha$ luminosity density from AGNs is
comparable to the observed Ly$alpha$ luminosity density from star-forming
galaxies at $z=0.3$. We suggest that this significant contribution from AGNs to
the total observed Ly$alpha$ luminosity density persists out to $zsim2.2$. | | Source: | arXiv, 1709.6092 | | Services: | Forum | Review | PDF | Favorites | |
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