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 catalogue: 778 absorption sys- tems spanning 2≲z≲6.5.Monthly Notices of the Royal Astronomical Society 521, 289–313 (2023)
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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.