Topic: Astronomy
Astronomers at Durham University used the James Webb Space Telescope to discover a galaxy's core from over 9 billion years ago. The galaxy had a compact, star-forming structure at its center, showing that galaxies developed complex internal structures much earlier than scientists thought.
Astronomers at Durham University have made a groundbreaking discovery about how galaxies formed and evolved in the early universe. They used powerful new observations from the James Webb Space Telescope to find the most distant example ever of a compact, star-forming structure at the heart of a galaxy. This structure is called a nuclear disk, which is a dense, rotating disk of stars at the very center of a galaxy.
A nuclear disk is common in nearby, mature galaxies, but this discovery shows that they existed much earlier than scientists assumed. The team made the discovery using data from the James Webb Space Telescope, which has unprecedented sensitivity and sharp resolution. This allowed them to study distant galaxies in extraordinary detail.
The galaxy they studied is seen as it was just 4.5 billion years after the Big Bang. At its center, the researchers identified a nuclear disk that is actively forming new stars and still growing. Crucially, the nuclear disk appears to have been built by a long, bar-shaped structure of stars stretching across the galaxy.
These bars are a familiar feature of many present-day spiral galaxies and act like cosmic engines, driving gas and stars toward the center and helping new structures form. While previous studies had shown that bars can form early, there was no direct proof that they were already reshaping galaxies at this stage in the universe's history.
Why It Matters
This discovery helps us understand how galaxies formed and evolved over billions of years. It also has implications for our understanding of supermassive black holes, which are found at the centers of most galaxies.
Key Facts
- Astronomers at Durham University discovered a galaxy's core from over 9 billion years ago using the James Webb Space Telescope.
- The galaxy had a compact, star-forming structure at its center, called a nuclear disk.
- Nuclear disks are common in nearby galaxies but were thought to exist much later in cosmic history.
- The discovery suggests that galaxies developed complex internal structures much earlier than scientists assumed.
- The research has implications for our understanding of supermassive black holes and galaxy formation.
Key Terms
- Nuclear Disk
- A dense, rotating disk of stars at the very center of a galaxy.
- Bar-Shaped Structure
- A long, bar-shaped structure of stars stretching across a galaxy that acts like a cosmic engine.
- James Webb Space Telescope
- A powerful space telescope with unprecedented sensitivity and sharp resolution that allows astronomers to study distant galaxies in extraordinary detail.
Implications
This discovery helps us understand how galaxies formed and evolved over billions of years. It also has implications for our understanding of supermassive black holes, which are found at the centers of most galaxies.
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