Blueshifted metal absorption lines in three z=7.2-9.3 galaxies indicate that metal-enriched, kinematically disturbed gas was already present around galaxies before the midpoint of cosmic reionization.
A.et al.High-velocity Outflows in [O III] Emitters at 2.5 < z < 9 from JWST NIRSpec Medium-resolution Spectroscopy.The Astrophysical Journal 25 994, 102 (2025)
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Early metal-enriched baryon cycling before the midpoint of cosmic reionization
Blueshifted metal absorption lines in three z=7.2-9.3 galaxies indicate that metal-enriched, kinematically disturbed gas was already present around galaxies before the midpoint of cosmic reionization.