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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2021

Lyman-α transmission properties of the intergalactic medium in the CoDaII simulation

Max Gronke
  • Fonction : Auteur
Pierre Ocvirk
Charlotte Mason
Jorryt Matthee
Sarah Bosman
Jenny Sorce
  • Fonction : Auteur
  • PersonId : 1218626
  • IdHAL : jennygsorce
Joseph Lewis
Kyungjin Ahn
  • Fonction : Auteur
Taha Dawoodbhoy
Ilian Iliev
Paul Shapiro
  • Fonction : Auteur
Gustavo Yepes

Résumé

Abstract The decline in abundance of Lyman-α (Lyα) emitting galaxies at z ≳ 6 is a powerful and commonly used probe to constrain the progress of cosmic reionization. We use the CoDaII simulation, which is a radiation hydrodynamic simulation featuring a box of ∼94 comoving Mpc side length, to compute the Lyα transmission properties of the intergalactic medium (IGM) at z ∼ 5.8 to 7. Our results mainly confirm previous studies, i.e. we find a declining Lyα transmission with redshift and a large sightline-to-sightline variation. However, motivated by the recent discovery of blue Lyα peaks at high redshift, we also analyse the IGM transmission on the blue side, which shows a rapid decline at z ≳ 6 of the blue transmission. This low transmission can be attributed not only to the presence of neutral regions but also to the residual neutral hydrogen within ionized regions, for which a density even as low as nHI ∼ 10−9 cm−3 (sometimes combined with kinematic effects) leads to a significantly reduced visibility. Still, we find that $\sim 1{{\ \rm per\ cent}}$ of sightlines towards M1600AB ∼ −21 galaxies at z ∼ 7 are transparent enough to allow a transmission of a blue Lyα peak. We discuss our results in the context of the interpretation of observations.
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hal-03388643 , version 1 (21-04-2023)

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Max Gronke, Pierre Ocvirk, Charlotte Mason, Jorryt Matthee, Sarah Bosman, et al.. Lyman-α transmission properties of the intergalactic medium in the CoDaII simulation. Monthly Notices of the Royal Astronomical Society, 2021, ⟨10.1093/mnras/stab2762⟩. ⟨hal-03388643⟩
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