Two Protoclusters of Galaxies Spotted in Early Universe astronomy space science
Each of the two newly-discovered protoclusters, MAGAZ3NE J095924+022537 and MAGAZ3NE J100028+023349 , hosts an ultramassive galaxy — the progenitor of brightest cluster galaxies seen in modern-day massive galaxy clusters — in its center. Notably, and in marked contrast to previously discovered protoclusters, MAGAZ3NE J0959 contains a high fraction of quiescent galaxies.
“In the early Universe, all protoclusters discovered until now are full of vigorously star-forming galaxies,” said Ian McConachie, a graduate student in the Department of Physics and Astronomy at the University of California, Riverside. “We are seeing this protocluster as it appeared when the Universe was less than 2 billion years old,” said Professor Gillian Wilson, an astronomer in the Department of Physics and Astronomy at the University of California, Riverside., the nearest rich cluster of galaxies to Earth, and plopped it into the early Universe.”
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