Absorption Troughs of Lyman Alpha Emitters in HETDEX
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2024
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| author | Weiss, Laurel H. Davis, Dustin Gebhardt, Karl Gazagnes, Simon Khanlari, Mahan Mirza 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 Niemeyer, Maja Lujan Saito, Shun Schneider, Donald P. Zeimann, Gregory R. |
| author_facet | Weiss, Laurel H. Davis, Dustin Gebhardt, Karl Gazagnes, Simon Khanlari, Mahan Mirza 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 Niemeyer, Maja Lujan Saito, Shun Schneider, Donald P. Zeimann, Gregory R. |
| contents | The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than one million Ly$α$ emitting galaxies (LAEs) between $1.88 < z < 3.52$. In addition to its cosmological measurements, these data enable studies of Ly$α$ 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 Ly$α$ profile for the $z \sim 2-3$ epoch and to understand their physical properties. We find clear absorption wings around Ly$α$ emission, which extend $\sim 2000$ km $\mathrm{s}^{-1}$ both redward and blueward of the central line. Using far-UV spectra of nearby ($0.002 < z < 0.182$) LAEs in the CLASSY treasury and optical/near-IR spectra of $2.8 < z < 6.7$ LAEs in the MUSE-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 Lyman-$α$ systems. Simple simulations of Ly$α$ radiative transfer can produce similar troughs due to absorption of light from background sources by HI gas surrounding the LAEs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_02490 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Absorption Troughs of Lyman Alpha Emitters in HETDEX Weiss, Laurel H. Davis, Dustin Gebhardt, Karl Gazagnes, Simon Khanlari, Mahan Mirza 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 Niemeyer, Maja Lujan Saito, Shun Schneider, Donald P. Zeimann, Gregory R. Astrophysics of Galaxies The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than one million Ly$α$ emitting galaxies (LAEs) between $1.88 < z < 3.52$. In addition to its cosmological measurements, these data enable studies of Ly$α$ 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 Ly$α$ profile for the $z \sim 2-3$ epoch and to understand their physical properties. We find clear absorption wings around Ly$α$ emission, which extend $\sim 2000$ km $\mathrm{s}^{-1}$ both redward and blueward of the central line. Using far-UV spectra of nearby ($0.002 < z < 0.182$) LAEs in the CLASSY treasury and optical/near-IR spectra of $2.8 < z < 6.7$ LAEs in the MUSE-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 Lyman-$α$ systems. Simple simulations of Ly$α$ radiative transfer can produce similar troughs due to absorption of light from background sources by HI gas surrounding the LAEs. |
| title | Absorption Troughs of Lyman Alpha Emitters in HETDEX |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.02490 |