MEGATRON: The Physical Origins of Steep UV Slopes at High Redshift

arXiv:2609.36124 · astro-ph.GA · Submitted 2026-09-28 · Read on arXiv

astro-ph.GA

Submitted: 2026-09-28

Updated: 2026-09-28

Terminology

• Aperture — 6× in this paper · explained in 1 episode
• Metallicity — 5× in this paper · explained in 3 episodes
• Dust Attenuation — 2× in this paper · explained in 2 episodes
• Stellar Feedback — 2× in this paper · explained in 2 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• EPOCHS III: Unbiased UV continuum slopes at 6.5<z<13 from combined PEARLS GTO and public JWST NIRCam imaging
• Zapped then Napped? A rapidly quenched remnant leaker candidate with a steep spectroscopic $\beta_{UV}$ slope at z=8.5
• MEGATRON: the impact of non-equilibrium effects and local radiation fields on the circumgalactic medium at cosmic noon
• A first GLIMPSE into star clusters populations across cosmic time
• Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies
• JWST & ALMA Joint Analysis with [OII]$\lambda\lambda$3726,3729, [OIII]$\lambda$4363, [OIII]88$\mu$m, and [OIII]52$\mu$m: Multi-Zone Evolution of Electron Densities at $\mathbf{z\sim0-14}$ and Its Impact on Metallicity Measurements
• Ionizing Photon Production Efficiencies and Chemical Abundances at Cosmic Dawn Revealed by Ultra-Deep Rest-Frame Optical Spectroscopy of JADES-GS-z14-0
• 21 Balmer Jump Street: The Nebular Continuum at High Redshift and Implications for the Bright Galaxy Problem, UV Continuum Slopes, and Early Stellar Populations
• MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations
• The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies
• Power-law Emission-line Wings and Radiation-Driven Superwinds in Local Lyman Continuum Emitters
• Stochastic star formation and the abundance of $z>10$ UV-bright galaxies
• Bursts of star formation and radiation-driven outflows produce efficient LyC leakage from dense compact star clusters
• Galaxies in the Epoch of Reionization Are All Bark and No Bite -- Plenty of Ionizing Photons, Low Escape Fractions
• Duration and properties of the embedded phase of star formation in 37 nearby galaxies from PHANGS-JWST
• The JWST/AURORA Survey: Multiple Balmer and Paschen Emission Lines for Individual Star-forming Galaxies at z=1.5-4.4. I. A Diversity of Nebular Attenuation Curves and Evidence for Non-Unity Dust Covering Fractions
• MEGATRON: how the first stars can create an iron metallicity plateau in the smallest dwarf galaxies
• Hitting the slopes: A spectroscopic view of UV continuum slopes of galaxies reveals a reddening at z > 9.5
• The THESAN-ZOOM project: Star-formation efficiencies in high-redshift galaxies
• The JWST Spectroscopic Properties of Galaxies at $z=9-14$

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• Deriving volume density profiles of filaments from observed surface densities
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• MEGATRON: how the first stars can create an iron metallicity plateau in the smallest dwarf galaxies