Details

Autor(en) / Beteiligte

• Weiss, Laurel H
• Davis, Dustin
• Gebhardt, Karl
• Gazagnes, Simon
• Mahan, Mirza Khanlari
• Cooper, Erin Mentuch
• Chisholm, John
• Berg, Danielle
• Bowman, William P
• Byrohl, Chris
• Ciardullo, Robin
• Fabricius, Maximilian
• Farrow, Daniel
• Gronwall, Caryl
• Hill, Gary J
• House, Lindsay R
• Jeong, Donghui
• Khoraminezhad, Hasti
• Kollatschny, Wolfram
• Komatsu, Eiichiro
• Maja Lujan Niemeyer
• Saito, Shun
• Schneider, Donald P
• Zeimann, Gregory R

Titel

Absorption Troughs of Lyα Emitters in HETDEX

Ist Teil von

• The Astrophysical journal, 2024-02, Vol.962 (2), p.102

Ort / Verlag

Philadelphia: IOP Publishing

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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.