preprintThe Open Journal of AstrophysicsFeb 2, 2026DIAMOND OA

The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies

HKHarley KatzMPMartin P. ReyCCCorentin CadiouTKTaysun KimmOAOscar Agertz

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Abstract

We introduce MEGATRON, a new galaxy formation model for cosmological radiation hydrodynamics simulations of high-redshift galaxies. The model accounts for the non-equilibrium chemistry and heating/cooling processes of ≥ 80 atoms, ions, and molecules, coupled to on-the-fly radiation transfer. We apply the model in a cosmological setting to the formation of a halo at z = 6 , and run 25 realizations at pc-scale resolution, varying numerous parameters associated with our state-of-the-art star formation, stellar feedback, and chemical enrichment models. We show that the overall budget of feedback energy is the key parameter that controls star formation regulation at high redshift, with other numerical…

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Topics & keywords

Topics
Keywords
  • Interstellar medium
  • Physics
  • Galaxy
  • Redshift
  • Astrophysics
  • Star formation
  • Astronomy
  • Star (game theory)
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