A surprisingly high percentage of dead galaxies found in the “city” of ancient galaxies

In the early universe, all previously discovered distant protoclusters, such as the “cobweb” (left: artist’s impression), are full of actively star-forming galaxies. In contrast, the newly discovered protocluster “MAGAZ3NE J095924 + 022537” contains a high proportion of red and dead galaxies, such as the nearby “Coma Cluster” (right). The discovery of ancient galaxy clusters, including galaxy-like galaxies found in modern galaxy clusters, was a great surprise. Credit: Spiderweb: M. Kornmesser / ESO; Coma: Las Carroll, Robert Gendler, Bob Franke / Dan Zowada Memorial Observatory.

An international team of astronomers, led by researchers at the University of California, Riverside, have discovered an unusually large cluster of young galaxies forming in the early universe. The newly discovered metropolis of the growing galaxy, MAGAZ3NE J095924 + 022537, is a new cluster of galaxies with at least 38 members, or protoclusters, about 11.8 billion light-years away from Earth.

The cluster of galaxies grows over time gravityAnd today universeCan contain hundreds or thousands Galaxy, As well as hot gas and dark matter. Over time, their galaxies burn available fuel and evolve from actively star-forming galaxies to dead red galaxies.

“In the early universe, all the protoclusters discovered so far are full of galaxies that actively form stars,” said a graduate student in physics and astronomy at the University of California, Riverside. Astrophysical Journal.. “But unbelievably, unlike all other protoclusters discovered during this period, many galaxies in MAGAZ3NEJ0959 appear to have already stopped forming. Performer.. ”

Gillian Wilson, a professor of physics and astronomy at UCR who works in Makonachi’s laboratory, said that J0959 is a giant galaxy and its research purpose, “Z> 3 Giant Ancient Galaxy at Near Infrared” ( MAGAZ3NE) said it was discovered from a survey. neighbor.

“We are looking at this protocluster, as it appeared when the universe was less than two billion years old,” she said. “It’s as if we took a cluster of galaxies, like a top, which is the closest cluster to the Earth, and dropped it into the early universe.”

Co-author Benjamin Forest is a former postdoctoral fellow in Wilson’s lab, now based at the University of California, Davis, and at the heart of the MAGAZ3NE J0959 is a giant that has already formed over 200 billion solar masses. I explained that there is a galaxy.

“It’s great why this giant galaxy and many of its neighbors formed most of the stars and, in contrast to other known protogalaxies of the same period, became inactive when the universe was still very young. It’s a mystery, “he said. “It’s a complete mystery why that galaxy is so different from all other known protocluster galaxies and so similar to the Koma galaxy.”

Forrest added that the MAGAZ3NE J0959 was discovered from the ground, but with the advent of powerful new features like the recently launched James Webb Space Telescope, other protoclusters filled with dead galaxies like the MAGAZ3NE J0959. Early universe.

“If a large number of such protoclusters are discovered, that would mean that the current paradigm of protocluster formation requires major revisions,” Forrest said. “We need to adopt a new scenario of protoclusters that exist in various states of the early universe. This will almost certainly be the current model of galaxy simulation, as many member galaxies will quench in the first 2 billion years. It poses a serious challenge. “

The team used spectroscopic observations of the WM Keck Observatory’s Multi-Object Spectrograph for Infrared Exploration (MOSFIRE) to make detailed measurements of the MAGAZ3NE J0959 and accurately quantify the distance.

Closely related to the question of how giant galaxies are formed is the environmental issue in which they are formed. For example, are they always found in overcrowded environments such as protoclusters, or can they be formed in isolation? Next, the team plans to study the vicinity of all other giant galaxies in the MAGAZ3NE survey to answer this question.

Other researchers involved in this study are Cemile Marsan and Adam Muzzin from the University of York, Canada. Michael Cooper at the University of California, Irvine. Marianna Annunziatella and Danielo Marchesini of Tufts University; Jeffrey Chan and Mohammed Abdulla of UCR. Percy Gomez at Keck Observatory; Paolo Saracco at Brera Astronomical Observatory, Italy. Julie Nantais of Andres Velho National University in Santiago, Chile.

Astronomers discover rare monster galaxies in the very early universe

For more information:
Ian McConachie et al, spectroscopic confirmation of protoclusters at z = 3.37 with high proportion of quiescent galaxies, Astrophysical Journal (2022). DOI: 10.3847 / 1538-4357 / ac2b9f

Quote: A surprisingly high percentage of dead galaxies found in the “city” of ancient galaxies (February 9, 2022) is https: // Obtained from galaxies.html on February 9, 2022

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A surprisingly high percentage of dead galaxies found in the “city” of ancient galaxies

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