The radiation emitted by the first galaxies in our Universe ionised the hydrogen in the intergalactic medium (IGM) during the first billion years, ushering in the Epoch of Reionisation. How did this last major phase transition that governed the evolution of the galaxies we see today happen? Was it driven by the few bright or numerous faint galaxies? Current and upcoming optical, near-infrared...
In the past years, the James Web Space (JWST) telescope has reshaped significantly our compre- hension of the first billion years following the Big Bang. To the surprise of the community, JWST is unveiling a greater abundance of galaxies, in more advanced stages of evolution than predicted by current galaxy models. These new observations are improving our understanding of the Epoch of...
