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.
D.et al.The Evolution of O I over 3.2 < z < 6.5: Reionization of the Circumgalactic Medium.The Astrophysical Journal883, 163 (2019)
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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.