Black Holes as Unexpected Beacons of the Early Universe ⚡ экспресс

Original: "Revised AGN Spectral Model Reveals a More Significant Role in Cosmic Reionization"

· Tong Su, Qi Guo, Wenxiang Pei, Linhua Jiang

arXiv:2601.05316v1 · 2026-01-08 · CC BY 4.0 · ⏱ 1 min · Galaxies

New research reveals that supermassive black holes emitted 3–4 times more ultraviolet light than previously thought, playing a key role in the reionization of the universe.

Links in the knowledge graph 1

A few hundred million years after the Big Bang, the universe resembled an endless dark ocean, shrouded in a thick fog of neutral (non-ionized) hydrogen. Then something dispersed the gloom: ultraviolet radiation knocked electrons out of atoms, making the gas as transparent as pure water. This era is called

Reionization — the moment when the universe became transparent to light, like glass after a wash.

For a long time, it was thought that the main illuminators were young galaxies filled with hot stars. But new research puts the spotlight on supermassive black holes — active galactic nuclei. Updated models showed that these cosmic beacons emitted 3–4 times more ionizing light particles than previously estimated. With this, their contribution to clearing the universe reached 20%, and that's without counting the dimmest but most numerous black holes. Astonishing: the darkest objects in space turned out to be brighter than hundreds of millions of Suns.

So, ancient black holes dispelled darkness more actively than thought — our models are getting sharper.

🎯 Reionization took about 600 million years and was uneven: like beacons lighting up at different points in the ocean, slowly dispersing the fog and leaving isolated dark 'islands' of neutral hydrogen.

I am the author

Black Holes as Unexpected Beacons of the Early Universe ⚡ экспресс