GHZ2 at z=12.3 shows a stratified ISM with coexisting density zones and needs an additional hard ionising component beyond pure radiation-bounded stellar models to match its emission lines and variability.
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2 Pith papers cite this work. Polarity classification is still indexing.
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Abundance analysis of 84 type-2 AGNs finds oversolar He and subsolar O at z>2.8, including one object at z=6.26 with record He abundance of 12+log(He/H)=11.64, plus marginal trends of declining He/H and rising O/H toward z=0.
citing papers explorer
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Investigating ionising sources and the complex interstellar medium of GHZ2 at $z=12.3$
GHZ2 at z=12.3 shows a stratified ISM with coexisting density zones and needs an additional hard ionising component beyond pure radiation-bounded stellar models to match its emission lines and variability.
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Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs
Abundance analysis of 84 type-2 AGNs finds oversolar He and subsolar O at z>2.8, including one object at z=6.26 with record He abundance of 12+log(He/H)=11.64, plus marginal trends of declining He/H and rising O/H toward z=0.