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The starry, dusty origin of a galaxy cluster at z = 4!

8 Aug 2020, 13:05 UTC
The starry, dusty origin of a galaxy cluster at z = 4!
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Title: Emergence of an Ultra-Red, Ultra-Massive Galaxy Cluster Core at z = 4 Authors: Arianna S. Long, Asantha Cooray, Jingzhe Ma, Caitlin M. Casey, Julie L Wardlow, Hooshang Nayyeri, R. J. Ivison, Duncan Farrah, and Helmut DannerbauerFirst author’s institution: Department of Physics and Astronomy, University of California, Irvine, USA
Status: Submitted to The Astrophysical Journal, open access on arXivGalaxy clusters are vast entities. They contain 100 to 1000 galaxies, making them the largest gravitationally stable structures in the cosmos. One of the assumptions of our understanding of the Universe is structures form hierarchically—smaller gravitational objects form first followed by the largest. Therefore, to form large objects like clusters, smaller objects such as galaxies need to collide and merge together over a long period of time. Although we generally know how clusters form, the specific process by which they grow is not yet well understood. The progenitors of clusters, known as protoclusters, are typically found at redshifts greater than 2 (the higher the redshift, the farther back it is in time), when the Universe was about one third of its current size. Unlike the clusters we observe today, protoclusters do not appear to have an established population of “red and dead” ...

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