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Abstract Galaxy clusters are the most massive, gravitationally bound structures in the Universe. They emerged through hierarchical structure formation of large-scale dark matter and baryon overdensities. Early galaxy ‘proto-clusters’ are believed to have substantially contributed to the cosmic star-formation rate density and served as ‘hotspots’ for the reionization of the intergalactic medium.
Abstract The first observations of JWST have revolutionized our understanding of the Universe by identifying for the first time galaxies at \(z\sim 13\)1–3. In addition, the discovery of many luminous galaxies at Cosmic Dawn (\(z > 10\)) has suggested that galaxies developed rapidly, in apparent tension with many standard models4–8. However, most of these galaxies lack spectroscopic confirmation, so their distances and properties are uncertain.
Author notes These authors contributed equally: Irene Shivaei, Renske Smit Authors and Affiliations Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, UK Joris Witstok, Roberto Maiolino, Mirko Curti, Francesco D’Eugenio, Tobias J. Looser, William M. Baker, Lester Sandles, Jan Scholtz & Sandro Tacchella Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, UK Joris Witstok, Roberto Maiolino, Mirko Curti, Francesco D’Eugenio, Tobias J.
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