Simulating realistic Lyman-$α$ emitting galaxies including the effect of radiative transfer
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914173013721088 |
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| author | Khoraminezhad, Hasti Saito, Shun Gronke, Max Byrohl, Chris |
| author_facet | Khoraminezhad, Hasti Saito, Shun Gronke, Max Byrohl, Chris |
| contents | We present an empirical yet physically motivated simulation of realistic Lyman-$α$ emitters (LAEs) at $z\sim2-3$, crucial for ongoing and forthcoming cosmological LAE surveys. We combine an empirical $\mathtt{UniverseMachine}$ galaxy-halo model with a simple spherical expanding shell model for the Lyman-$α$ radiative transfer, calibrating only three free parameters to simultaneously reproduce the observed Lyman-$α$ luminosity function and the angular clustering. Our LAE model is further supported by its consistency with other observables such as the Lyman-$α$ equivalent width distribution, the Lyman-$α$ escape fraction as a function of stellar mass and dust reddening, and the systemic velocity offsets. Our LAE model provides predictions for the halo occupation distributions for LAEs and relationship between Ly$α$ luminosity and halo mass, including the distribution of satellite LAEs. Our work provides a crucial first step towards creating a high-fidelity LAE synthetic catalog for the LAE cosmology surveys. We make our LAE catalog and spectra publicly available upon publication. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_16707 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Simulating realistic Lyman-$α$ emitting galaxies including the effect of radiative transfer Khoraminezhad, Hasti Saito, Shun Gronke, Max Byrohl, Chris Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present an empirical yet physically motivated simulation of realistic Lyman-$α$ emitters (LAEs) at $z\sim2-3$, crucial for ongoing and forthcoming cosmological LAE surveys. We combine an empirical $\mathtt{UniverseMachine}$ galaxy-halo model with a simple spherical expanding shell model for the Lyman-$α$ radiative transfer, calibrating only three free parameters to simultaneously reproduce the observed Lyman-$α$ luminosity function and the angular clustering. Our LAE model is further supported by its consistency with other observables such as the Lyman-$α$ equivalent width distribution, the Lyman-$α$ escape fraction as a function of stellar mass and dust reddening, and the systemic velocity offsets. Our LAE model provides predictions for the halo occupation distributions for LAEs and relationship between Ly$α$ luminosity and halo mass, including the distribution of satellite LAEs. Our work provides a crucial first step towards creating a high-fidelity LAE synthetic catalog for the LAE cosmology surveys. We make our LAE catalog and spectra publicly available upon publication. |
| title | Simulating realistic Lyman-$α$ emitting galaxies including the effect of radiative transfer |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2507.16707 |