In Search of the First Stars: An Ultra-compact and Very-low-metallicity Lyα Emitter Deep within the Epoch of Reionization
Chris J. Willott; Yoshihisa Asada; Kartheik G. Iyer; Jon Judež; Gregor Rihtaršič; Nicholas S. Martis; Ghassan T. E. Sarrouh; G. Desprez · 2025 · The Astrophysical Journal
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Abstract
Abstract 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 metal-poor galaxies known at z > 7. The galaxy has a high H β equivalent width of 225 ± 50 Å, small half-light radius of only r hl = 3 8 − 19 + 3 pc, and high star formation rate density of 50–100 M ⊙ yr −1 kpc −2 . The galaxy shows high-equivalent-width Ly α emission with an i
Abstract by Chris J. Willott; Yoshihisa Asada; Kartheik G. Iyer; Jon Judež; Gregor Rihtaršič; Nicholas S. Martis; Ghassan T. E. Sarrouh; G. Desprez, The Astrophysical Journal (2025) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/1538-4357/addf49