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.
L.et al.The XQR-30 Metal Absorber Catalog: 778 Absorption Systems Spanning 2 < z < 6.5 (2022)
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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.