Updated

Updated · Universiteit Leiden · Jun 22

James Webb Spots 6 Merging Galaxies Around Young Black Hole 12 Billion Light-Years Away

Updated

Updated · Universiteit Leiden · Jun 22

James Webb Spots 6 Merging Galaxies Around Young Black Hole 12 Billion Light-Years Away

Q: Six galaxies were seen merging 12 billion years ago. What cosmic titan do astronomers believe exists in their place today?

Astronomers think the six galaxies are likely the ancestors of a giant central galaxy — probably a brightest cluster galaxy, an enormous elliptical system at the heart of a present-day galaxy cluster. The JWST observations show at least six galaxies packed into a dense early-universe “protocluster” more than 12 billion light-years away, with a young supermassive black hole already growing at the center. Researchers say this is a rare snapshot of several massive galaxies caught in the act of merging into one much larger system. That larger system would not just be a single galaxy in isolation. Because the region is so dense, astronomers view it as a precursor to one of today’s massive galaxy-cluster environments. In other words, the merging galaxies likely built the huge central galaxy, while the surrounding structure evolved into a cluster or group of galaxies. So the “cosmic titan” believed to stand there today is a colossal cluster-center galaxy, anchored by a supermassive black hole and embedded in a mature galaxy cluster.

3 articles · Updated · Universiteit Leiden · Jun 22

At least six galaxies appear to be converging in system TGSSJ1530+1049, giving astronomers a direct view of a giant galaxy assembling when the universe was about 1.5 billion years old.
James Webb targeted the site after earlier radio data hinted at an active supermassive black hole, then revealed a far denser and more complex structure than expected.
Four of the galaxies are already surprisingly massive, together holding hundreds of billions of solar masses of stars within a region only a few tens of thousands of light-years across.
Radio imaging suggests the central black hole is still relatively young, with emission produced by infalling material and high-speed outflows as it grows.
Researchers describe the system as a protocluster—a rare early-stage precursor of today’s largest galaxy collections—capturing both galaxy assembly and black hole growth in one scene.

Sources

Universiteit Leiden4d ago

James Webb Space Telescope Observes Merging Galaxies and Growing Supermassive Black Hole in Early Universe

tovima.com21h ago

Black Hole Too Big for Its Age Spotted by James Webb - tovima.com

AOL4d ago

JWST discovers a massive primordial black hole that may have formed before stars - AOL

4 Sources

Six galaxies were seen merging 12 billion years ago. What cosmic titan do astronomers believe exists in their place today?

How can a supermassive black hole be considered 'young' while orchestrating a merger of six massive, ancient galaxies?

This glimpse of a galactic nursery is 12 billion years old. Does it confirm the violent origin story of our own Milky Way?

Witnessing Cosmic Construction: JWST’s Discovery of TGSSJ1530+1049 and the Early Co-Evolution of Galaxies and Black Holes

Overview

The James Webb Space Telescope has revealed TGSSJ1530+1049, a compact group of at least six galaxies merging around a young, energetic supermassive black hole as seen 12 billion years ago. This system, known as a protocluster, gives scientists a rare look at how matter began to gather and form the universe’s earliest large structures. By observing TGSSJ1530+1049, researchers gain unique insight into the foundational processes of cosmic evolution, witnessing a pivotal moment when the ancestors of today’s massive galaxies and black holes were actively taking shape.

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