Abstract We present a sample of six F200W and three F277W dropout sources identified as 16 16 candidates present mass-weighted ages around 30 Myr, and attenuations A ( V ) < 0.1 mag. Their average stellar mass is M ⋆ ∼ 10 7 M ⊙ , implying a stellar-to-baryon mass fraction around 10% if the emissivity increases with redshift, or significantly higher otherwise. Three candidates present very blue UV spectral slopes ( β ∼ −3) compatible with Population III young (≲10 Myr) stars and/or high escape fractions of ionizing photons; the rest have β ∼ −2.5 similar to the z = 10–12 samples.
Pérez‐González et al. (2025) studied this question.