Early metal-enriched baryon cycling before the midpoint of cosmic reionization

TL;DR

This study provides direct observational evidence of metal-enriched, kinematically disturbed gas around galaxies at redshifts 7.2-9.3, indicating rapid early metal production and baryon cycling before the midpoint of cosmic reionization.

Contribution

First direct detection of metal-enriched gas in multiple ionic phases around galaxies at z>7, revealing early baryon cycling before reionization completion.

Findings

Detected blueshifted metal absorption lines in three high-redshift galaxies.

Observed ionic coexistence and velocity offsets suggest outflowing or disturbed gas.

Indicates rapid metal enrichment and baryon cycling in early galaxies.

Abstract

Models predict that chemical enrichment and gas redistribution should proceed rapidly once star formation begins, yet direct observational constraints at the earliest cosmic epochs have been scarce. Here we present evidence that metal-enriched gas in multiple ionic phases was already present around galaxies before the midpoint of cosmic reionization. Using JWST/NIRSpec rest-frame ultraviolet spectroscopy of three galaxies at redshifts $z=7.2-9.3$, we detect blueshifted metal absorption in all three systems; across the sample, the detected transitions span neutral, low-ionization, and high-ionization species, including O I, Si II, C II, Si IV, and C IV. These absorption features show velocity offsets of order $|\Delta v| \sim 50$--$250\,\mathrm{km\,s^{-1}}$, predominantly blueshifted relative to the systemic redshifts of the host galaxies derived from nebular emission lines. This ionic coexistence within a broadly shared velocity structure, together with the observed equivalent-width ratios, is consistent with outflowing or otherwise kinematically disturbed galaxy-associated gas, similar to that seen at lower redshift. The observations therefore indicate that metal-enriched gas associated with galaxies was already kinematically disturbed at very early times, requiring rapid metal production in the early generations of stars. These results show that key conditions for baryon cycling were established in at least a subset of luminous galaxies within the first several hundred million years of cosmic time, well before the completion of reionization.