The Universe at $Z > 5$: when and how did the `Dark Age' End?

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10652This paper considers how the first subgalactic structures produced the UV radiation that ionized the intergalactic medium before $z = 5$, and the `feedback' effects of the UV radiation on structure formation. The relevance of pregalactic activity to heavy element production and the origin of magnetic fields is briefly addressed.6 pages LaTeX, no figures, special style file includedAstrophysicsThe Universe at $Z > 5$: when and how did the `Dark Age' End?text