Hitting the slopes: a spectroscopic view of UV continuum slopes of galaxies reveals a reddening at z > 9.5
Aayush Saxena; Alex J. Cameron; Harley Katz; Andrew J. Bunker; Jacopo Chevallard; Francesco D’Eugenio; Santiago Arribas; Rachana Bhatawdekar · 2026 · Monthly Notices of the Royal Astronomical Society
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Abstract
ABSTRACT The ultraviolet (UV) continuum slope of galaxies, $\beta$, is a powerful diagnostic of the metallicity and ages of stars, nebular gas properties, dust content, and the escape of Lyman continuum (LyC) photons. In this study, we present $\beta$ measurements for 395 spectroscopically confirmed galaxies at $5 \lt z \lt 14.3$ selected primarily from JADES, using high-quality JWST (James Webb Space Telescope) NIRSpec/PRISM spectra. We find a median $\beta = -2.15$, finding a mild increase in blueness of $\beta$ with increasing redshift and fainter UV magnitudes. Interestingly, we find evide
Abstract by Aayush Saxena; Alex J. Cameron; Harley Katz; Andrew J. Bunker; Jacopo Chevallard; Francesco D’Eugenio; Santiago Arribas; Rachana Bhatawdekar, Monthly Notices of the Royal Astronomical Society (2026) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.1093/mnras/stag808