Kavli Affiliate: Eiichiro Komatsu
| First 5 Authors: Dustin Davis, Karl Gebhardt, Erin Mentuch Cooper, William P. Bowman, Barbara Garcia Castanheira
| Summary:
We describe the ensemble properties of the $1.9 < z < 3.5$ Lyman Alpha
Emitters (LAEs) found in the HETDEX survey’s first public data release, HETDEX
Public Source Catalog 1 (Mentuch Cooper et al. 2023). Stacking the
low-resolution ($R sim$ 800) spectra greatly increases the signal-to-noise
ratio, revealing spectral features otherwise hidden by noise, and we show that
the stacked spectrum is representative of an average member of the set. The
flux limited, Ly$alpha$ signal-to-noise ratio restricted stack of 50K HETDEX
LAEs shows the ensemble biweight “average" $z sim 2.6$ LAE to be a blue (UV
continuum slope $sim -2.4$ and E(B-V) $< 0.1$), moderately bright
(M$_{text{UV}} sim -19.7$) star forming galaxy with strong Ly$alpha$
emission (log $L_{Lyalpha}$ $sim$ 42.8 and $W_{lambda}$(Ly$alpha$) $sim$
114AA), and potentially significant leakage of ionizing radiation. The
restframe UV light is dominated by a young, metal poor stellar population with
an average age 5-15 Myr and metallicity of 0.2-0.3 Z$_{odot}$.
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