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  Variations in shape among observed Lyman-α spectra due to intergalactic absorption

Byrohl, C., & Gronke, M. (2020). Variations in shape among observed Lyman-α spectra due to intergalactic absorption. Astronomy and Astrophysics, 642: L16. doi:10.1051/0004-6361/202038685.

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Variations in shape among observed Lyman-α spectra due to intergalactic absorption.pdf (Any fulltext), 565KB
 
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Byrohl, C.1, Author              
Gronke, M., Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: Lyman-α (Lyα) spectra provide insights into the small-scale structure and kinematics of neutral hydrogen (HI) within galaxies as well as the ionization state of the intergalactic medium (IGM). The former defines the intrinsic spectrum of a galaxy, which, in turn, is modified by the latter. These two effects are degenerate. Using the IllustrisTNG100 simulation, we studied the impact of the IGM on Lyα spectral shapes between z ∼ 0 and 5. We computed the distribution of the expected Lyα peaks and of the peak asymmetry for different intrinsic spectra, redshifts, and large-scale environments. We find that the averaged transmission curves that are commonly applied give a misleading perception of the observed spectral properties. We show that the distributions of peak counts and asymmetry can lift the degeneracy between the intrinsic spectrum and IGM absorption. For example, we expect a significant number of triple-peaked Lyα spectra (up to 30% at z ∼ 3) if the galaxies’ HI distribution become more porous at higher redshift, as predicted by cosmological simulations. We provide a public catalog of transmission curves for simulations and observations to allow for a more realistic IGM treatment in future studies.

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Language(s): eng - English
 Dates: 2020-10-19
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/202038685
Other: LOCALID: 3278966
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 642 Sequence Number: L16 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1