학술논문
HETDEX Public Source Catalog 1 -- Stacking 50K Lyman Alpha Emitters
Document Type
Working Paper
Author
Davis, Dustin; Gebhardt, Karl; Cooper, Erin Mentuch; Bowman, William P.; Castanheira, Barbara Garcia; Chisholm, John; Ciardullo, Robin; Fabricius, Maximilian; Farrow, Daniel J.; Finkelstein, Steven L.; Gronwall, Caryl; Gawiser, Eric; Hill, Gary J.; Hopp, Ulrich; House, Lindsay R.; Jeong, Donghui; Kollatschny, Wolfram; Komatsu, Eiichiro; Liu, Chenxu; Niemeyer, Maja Lujan; Saldana-Lopez, Alberto; Saito, Shun; Schneider, Donald P.; Snigula, Jan; Tuttle, Sarah; Weiss, Laurel H.; Wisotzki, Lutz; Zeimann, Gregory
Source
Subject
Language
Abstract
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 $L_{Ly\alpha}$ $\sim$ 42.8 and $W_{\lambda}$(Ly$\alpha$) $\sim$ 114\AA), 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$_{\odot}$.
Comment: 17 pages, 11 figures, 2 data files (ApJ Accepted)
Comment: 17 pages, 11 figures, 2 data files (ApJ Accepted)