In Search of the First Stars: An Ultra-compact and Very-low-metallicity Lyα Emitter Deep within the Epoch of Reionization

• Published in: The Astrophysical journal Vol. 988; no. 1; pp. 26 - 35
• Main Authors: Willott, Chris J., Asada, Yoshihisa, Iyer, Kartheik G., Judež, Jon, Rihtaršič, Gregor, Martis, Nicholas S., Sarrouh, Ghassan T. E., Desprez, Guillaume, Harshan, Anishya, Mowla, Lamiya, Noirot, Gaël, Felicioni, Giordano, Bradač, Maruša, Brammer, Gabe, Muzzin, Adam, Sawicki, Marcin, Antwi-Danso, Jacqueline, Markov, Vladan, Tripodi, Roberta
• Format: Journal Article
• Language: English
• Published: The American Astronomical Society 20.07.2025; IOP Publishing
• Subjects: Emission line galaxies; Galaxy evolution; Lyman-alpha galaxies; Metallicity; Reionization

We present JWST observations of a gravitationally lensed, extremely metal-poor galaxy at redshift z = 8.203 ± 0.001 from the CANUCS survey. Based on the low oxygen to Balmer line ratios, we infer a gas-phase metallicity of 12 + log(O/H) = 6.85 (1.4% solar), making CANUCS-A370-z8-LAE one of the most...