TY - JOUR
T1 - Absorption Troughs of Lyα Emitters in HETDEX
AU - Weiss, Laurel H.
AU - Davis, Dustin
AU - Gebhardt, Karl
AU - Gazagnes, Simon
AU - Mirza Khanlari, Mahan
AU - Mentuch Cooper, Erin
AU - Chisholm, John
AU - Berg, Danielle
AU - Bowman, William P.
AU - Byrohl, Chris
AU - Ciardullo, Robin
AU - Fabricius, Maximilian
AU - Farrow, Daniel
AU - Gronwall, Caryl
AU - Hill, Gary J.
AU - House, Lindsay R.
AU - Jeong, Donghui
AU - Khoraminezhad, Hasti
AU - Kollatschny, Wolfram
AU - Komatsu, Eiichiro
AU - Lujan Niemeyer, Maja
AU - Saito, Shun
AU - Schneider, Donald P.
AU - Zeimann, Gregory R.
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than 1 million Lyα emitting galaxies (LAEs) 1.88 < z < 3.52. In addition to its cosmological measurements, these data enable studies of Lyα spectral profiles and the underlying radiative transfer. Using the roughly half a million LAEs in the HETDEX Data Release 3, we stack various subsets to obtain the typical Lyα profile for the z ∼ 2-3 epoch and to understand their physical properties. We find clear absorption wings around Lyα emission, which extend ∼2000 km s−1 both redward and blueward of the central line. Using far-UV spectra of nearby (0.002 < z < 0.182) LAEs in the COS Legacy Archive Spectroscopic Survey treasury and optical/near-IR spectra of 2.8 < z < 6.7 LAEs in the Multi Unit Spectroscopic-Wide survey, we observe absorption profiles in both redshift regimes. Dividing the sample by volume density shows that the troughs increase in higher-density regions. This trend suggests that the depth of the absorption is dependent on the local density of objects near the LAE, a geometry that is similar to damped Lyα systems. Simple simulations of Lyα radiative transfer can produce similar troughs due to absorption of light from background sources by H i gas surrounding the LAEs.
AB - The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than 1 million Lyα emitting galaxies (LAEs) 1.88 < z < 3.52. In addition to its cosmological measurements, these data enable studies of Lyα spectral profiles and the underlying radiative transfer. Using the roughly half a million LAEs in the HETDEX Data Release 3, we stack various subsets to obtain the typical Lyα profile for the z ∼ 2-3 epoch and to understand their physical properties. We find clear absorption wings around Lyα emission, which extend ∼2000 km s−1 both redward and blueward of the central line. Using far-UV spectra of nearby (0.002 < z < 0.182) LAEs in the COS Legacy Archive Spectroscopic Survey treasury and optical/near-IR spectra of 2.8 < z < 6.7 LAEs in the Multi Unit Spectroscopic-Wide survey, we observe absorption profiles in both redshift regimes. Dividing the sample by volume density shows that the troughs increase in higher-density regions. This trend suggests that the depth of the absorption is dependent on the local density of objects near the LAE, a geometry that is similar to damped Lyα systems. Simple simulations of Lyα radiative transfer can produce similar troughs due to absorption of light from background sources by H i gas surrounding the LAEs.
UR - https://www.scopus.com/pages/publications/85184931733
UR - https://www.scopus.com/pages/publications/85184931733#tab=citedBy
U2 - 10.3847/1538-4357/ad1b51
DO - 10.3847/1538-4357/ad1b51
M3 - Article
AN - SCOPUS:85184931733
SN - 0004-637X
VL - 962
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 102
ER -