Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa) III Simulation for H$α$ from Galaxies and the Intergalactic Medium during the Epoch of Reionization
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916706267430912 |
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| author | Lee, Eugene Hyeonmin Lee, Joohyun Shapiro, Paul R. Ocvirk, Pierre Lewis, Joseph S. W. Dawoodbhoy, Taha Iliev, Ilian T. Conaboy, Luke Ahn, Kyungjin Park, Hyunbae Sorce, Jenny G. Aubert, Dominique Teyssier, Romain Yepes, Gustavo Dubois, Yohan Gottlöber, Stefan |
| author_facet | Lee, Eugene Hyeonmin Lee, Joohyun Shapiro, Paul R. Ocvirk, Pierre Lewis, Joseph S. W. Dawoodbhoy, Taha Iliev, Ilian T. Conaboy, Luke Ahn, Kyungjin Park, Hyunbae Sorce, Jenny G. Aubert, Dominique Teyssier, Romain Yepes, Gustavo Dubois, Yohan Gottlöber, Stefan |
| contents | The evolution of large-scale structure, galaxies and the intergalactic medium (IGM) during the Epoch of Reionization (EoR) 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 H$α$ 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 Voxel Intensity Distribution (VID) vs. 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 Cosmic Dawn Intensity Mapper (CDIM). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15821 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa) III Simulation for H$α$ from Galaxies and the Intergalactic Medium during the Epoch of Reionization Lee, Eugene Hyeonmin Lee, Joohyun Shapiro, Paul R. Ocvirk, Pierre Lewis, Joseph S. W. Dawoodbhoy, Taha Iliev, Ilian T. Conaboy, Luke Ahn, Kyungjin Park, Hyunbae Sorce, Jenny G. Aubert, Dominique Teyssier, Romain Yepes, Gustavo Dubois, Yohan Gottlöber, Stefan Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The evolution of large-scale structure, galaxies and the intergalactic medium (IGM) during the Epoch of Reionization (EoR) 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 H$α$ 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 Voxel Intensity Distribution (VID) vs. 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 Cosmic Dawn Intensity Mapper (CDIM). |
| title | Line Intensity Mapping Prediction from the Cosmic Dawn (CoDa) III Simulation for H$α$ from Galaxies and the Intergalactic Medium during the Epoch of Reionization |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.15821 |