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Intervening metal absorbers in quasar spectra at z > 6 can be used as probes to study the chemical enrichment of the Universe during the Epoch of Reionization (EoR). This work presents the comoving line densities (dn/dX) of low ionisation absorbers, namely, Mg II (2796A), C II (1334A) and O I (1302A) across 2 0. 03A. For the first time, we present the comoving line densities of 131 weak (W 5, in agreement with previous works. In the context of a decline in metal enrichment of the Universe at z > 5, the overall evolution in the incidence rates of absorption systems can be explained by a weak - possibly soft fluctuating - UV background. Our results, thereby, provide evidence for a late reionization continuing to occur in metal-enriched and therefore, biased regions in the Universe.
Sebastian et al. (Fri,) studied this question.
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