Key project 1: Gamma-Ray Bursts and Quasars in the Era of Reionization – University of Copenhagen

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A galaxy from 13.1 billion years ago, when the universe was being reionized. (Inset) A simulation of the reionizing process, which cleared away the fog of hydrogen around the galaxy. Credit: NASA/ESA/G.Illingworth/ the HUDF09 Team; (inset) ESO.

Key project 1: Gamma-Ray Bursts and Quasars in the Era of Reionization

Investigating the epoch of reionization is fundamentally important for structure formation and cosmology as a whole, because it is during this phase that the first black holes grew into quasars and the first star-forming galaxies took shape, enriching the intergalactic medium. The highest redshift gamma-ray bursts, quasars, and galaxies so far discovered, have allowed us to probe the intergalactic medium and the history of star formation at the very end of this period, at redshifts of 6-6.5.