MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866916992808648704 |
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| author | Katz, Harley Rey, Martin P. Cadiou, Corentin Agertz, Oscar Blaizot, Jeremy Cameron, Alex J. Choustikov, Nicholas Devriendt, Julien Hauk, Uliana Jones, Gareth C. Kimm, Taysun Laseter, Isaac Martin-Alvarez, Sergio Matsumoto, Kosei Pearce, Autumn Montero, Francisco Rodríguez Rosdahl, Joki Sanati, Mahsa Saxena, Aayush Slyz, Adrianne Stiskalek, Richard Storck, Anatole Veenema, Oscar Yee, Wonjae |
| author_facet | Katz, Harley Rey, Martin P. Cadiou, Corentin Agertz, Oscar Blaizot, Jeremy Cameron, Alex J. Choustikov, Nicholas Devriendt, Julien Hauk, Uliana Jones, Gareth C. Kimm, Taysun Laseter, Isaac Martin-Alvarez, Sergio Matsumoto, Kosei Pearce, Autumn Montero, Francisco Rodríguez Rosdahl, Joki Sanati, Mahsa Saxena, Aayush Slyz, Adrianne Stiskalek, Richard Storck, Anatole Veenema, Oscar Yee, Wonjae |
| contents | We present the MEGATRON suite of cosmological radiation hydrodynamics simulations following the formation of Milky Way-mass galaxies from the earliest cosmic epochs when Population III stars form to Cosmic Noon. The suite represents the first set of cosmological simulations that couples a vast non-equilibrium thermochemistry network of primordial species, metals, and molecules to multifrequency, on-the-fly radiation transport, allowing us to directly predict the spectral properties of early galaxies. By initializing the simulations at zero metallicity, resolving haloes well below the atomic cooling threshold, reaching parsec-scale resolution, and modeling a Milky Way-mass environment, we aim to address four key science themes: 1) Star formation at cosmic dawn, 2) Galaxy formation and the interstellar medium in the epoch of reionization, 3) The circumgalactic medium towards cosmic noon, and 4) Reionization in a local volume environment and near-field cosmology. In this introductory work, we present an overview of the physical characteristics of high-redshift MEGATRON galaxies and their environment at $z>8$. We present a library of $>175,000$ simulated galaxy spectra and demonstrate how the diversity of galaxy spectra seen by JWST is naturally reproduced in the context of a $Λ$CDM cosmology. This project represents a step towards making more direct comparisons between simulations and observations and will enable future work to both optimize methods for inferring galaxy properties from observations and to elucidate the physics that governs galaxy formation in the early Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_05201 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations Katz, Harley Rey, Martin P. Cadiou, Corentin Agertz, Oscar Blaizot, Jeremy Cameron, Alex J. Choustikov, Nicholas Devriendt, Julien Hauk, Uliana Jones, Gareth C. Kimm, Taysun Laseter, Isaac Martin-Alvarez, Sergio Matsumoto, Kosei Pearce, Autumn Montero, Francisco Rodríguez Rosdahl, Joki Sanati, Mahsa Saxena, Aayush Slyz, Adrianne Stiskalek, Richard Storck, Anatole Veenema, Oscar Yee, Wonjae Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present the MEGATRON suite of cosmological radiation hydrodynamics simulations following the formation of Milky Way-mass galaxies from the earliest cosmic epochs when Population III stars form to Cosmic Noon. The suite represents the first set of cosmological simulations that couples a vast non-equilibrium thermochemistry network of primordial species, metals, and molecules to multifrequency, on-the-fly radiation transport, allowing us to directly predict the spectral properties of early galaxies. By initializing the simulations at zero metallicity, resolving haloes well below the atomic cooling threshold, reaching parsec-scale resolution, and modeling a Milky Way-mass environment, we aim to address four key science themes: 1) Star formation at cosmic dawn, 2) Galaxy formation and the interstellar medium in the epoch of reionization, 3) The circumgalactic medium towards cosmic noon, and 4) Reionization in a local volume environment and near-field cosmology. In this introductory work, we present an overview of the physical characteristics of high-redshift MEGATRON galaxies and their environment at $z>8$. We present a library of $>175,000$ simulated galaxy spectra and demonstrate how the diversity of galaxy spectra seen by JWST is naturally reproduced in the context of a $Λ$CDM cosmology. This project represents a step towards making more direct comparisons between simulations and observations and will enable future work to both optimize methods for inferring galaxy properties from observations and to elucidate the physics that governs galaxy formation in the early Universe. |
| title | MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.05201 |