Gronke, M; Ocvirk, P; Mason, C; Matthee, J; Bosman, SEI; Sorce, JG; Lewis, J; ... Yepes, G; + view all Gronke, M; Ocvirk, P; Mason, C; Matthee, J; Bosman, SEI; Sorce, JG; Lewis, J; Ahn, K; Aubert, D; Dawoodbhoy, T; Iliev, IT; Shapiro, PR; Yepes, G; - view fewer (2021) Lyman-α transmission properties of the intergalactic medium in the CoDaII simulation. Monthly Notices of the Royal Astronomical Society , 508 (3) pp. 3697-3709. 10.1093/mnras/stab2762.

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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∼10−9cm−3 (sometimes combined with kinematic effects) leads to a significantly reduced visibility. Still, we find that ∼1 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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