Article Dans Une Revue Res.Notes AAS Année : 2025

Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa). III. Simulation for Hα from Galaxies and the Intergalactic Medium During the Epoch of Reionization

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The evolution of large-scale structure, galaxies and the intergalactic medium (IGM) during the Epoch of Reionization can be probed by upcoming Line Intensity Mapping (LIM) experiments, which sample in redshift and direction without needing to resolve individual galaxies. We predict the intensity and sources of hydrogen Hα emission, dominated by radiative recombination following ionization by UV from the same massive stars that caused reionization, down to redshift 4.6, using the largest fully coupled, radiation-hydro simulation of galaxy formation and reionization to date, Cosmic Dawn (CoDa) III. We compute the mean intensity and VID versus redshift, including the relative contributions of galaxies and IGM. This will provide mock data to guide and interpret LIM experiments such as NASA’s SPHEREx and proposed CoDa Intensity Mapper.

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hal-05067987 , version 1 (15-05-2025)

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Eugene Hyeonmin Lee, Joohyun Lee, Paul R Shapiro, Pierre Ocvirk, Joseph S.W Lewis, et al.. Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa). III. Simulation for Hα from Galaxies and the Intergalactic Medium During the Epoch of Reionization. Res.Notes AAS, 2025, 9, pp.96. ⟨10.3847/2515-5172/adcea7⟩. ⟨hal-05067987⟩
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