Little Red Dots at an Inflection Point: Ubiquitous V-shaped Turnover Consistently Occurs at the Balmer Limit
David J. Setton; Jenny E. Greene; Anna de Graaff; Yilun 逸伦 Ma 马; Joel Leja; Jorryt Matthee; Rachel Bezanson; Leindert A. Boogaard · 2025 · The Astrophysical Journal
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Abstract
Abstract Among the most puzzling early discoveries of JWST are “little red dots” (LRDs), compact red sources that host broad Balmer emission lines, and in many cases exhibit a “V-shaped” change in slope in the rest-optical. The physical properties of LRDs currently have order-of-magnitude uncertainties, because models to explain the continuum of these sources differ immensely. Here, we leverage the complete selection of red sources in the RUBIES program, supplemented with public PRISM spectra, to study the origin of this V shape. By fitting a broken power law with a flexible inflection point,
Abstract by David J. Setton; Jenny E. Greene; Anna de Graaff; Yilun 逸伦 Ma 马; Joel Leja; Jorryt Matthee; Rachel Bezanson; Leindert A. Boogaard, The Astrophysical Journal (2025) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/1538-4357/ae1500