Astronomers have identified 12 new quasars dating back to when the universe was at most 770 million years old, providing a clearer window into the early stages of cosmic history. These findings, which include the two most distant quasars ever found, were detected by the Euclid space telescope and offer new data on the reionization era, according to reports from Leiden Observatory.
Why are these early quasars significant?
Quasars act as the brightest objects in the universe, shining with the intensity of a trillion stars. They are fueled by supermassive black holes drawing in vast amounts of matter. By observing these objects, scientists can study the conditions of the early universe, specifically the first 5% of its current age. According to researchers at Leiden Observatory, these quasars provide vital clues about how the first galaxies formed and how the universe transitioned from a cold, dark void to a transparent space during the reionization era.
The Euclid telescope’s sensitivity allows it to detect quasars that are 10 to 100 times fainter than those previously observable by older technology.
How do the new findings compare to previous records?
Before this discovery, only nine quasars were known with a redshift—a measurement of distance—of 7 or higher. The recent identification of 12 additional quasars significantly expands this catalog. Among these, two stand out with redshifts of 7.77 and 7.69, marking them as the most distant objects of their kind ever found. These two quasars originated within the first 670 million years of the universe, existing over 13 billion light-years away.
Comparative Data of Distant Quasars
| Category | Pre-Discovery | Post-Discovery |
|---|---|---|
| Known Quasars (Redshift ≥ 7) | 9 | 21 |
What role does the Euclid telescope play in future research?
The Euclid mission is currently mapping 1,900 square degrees of the sky, an area equivalent to roughly 10,000 full moons. Data collected by the telescope is expected to reveal hundreds of additional distant quasars. Astronomers anticipate that this dataset will eventually include the first quasars with a redshift exceeding 8, which would correspond to a time when the universe was no more than 640 million years old.
Recent follow-up observations, such as those conducted by a group led by Silvia Belladitta on a quasar identified by PhD candidate Daming Yang, show these black holes are often embedded in galaxies filled with gas and dust. These galaxies are actively forming new stars, helping scientists visualize the environment surrounding the universe’s earliest supermassive black holes.
When researching cosmic distance, look for the “redshift” value. A higher number indicates an object is further away and existed closer to the Big Bang.
Frequently Asked Questions
What is a quasar?
A quasar is an extremely bright, distant active galactic nucleus powered by a supermassive black hole consuming matter, releasing massive amounts of energy in the process.
What was the reionization era?
This was a period in the early universe when the light from the first stars and quasars ionized the surrounding gas, causing the universe to become transparent to ultraviolet radiation.
How far away are these newly discovered quasars?
The most distant specimens identified are located more than 13 billion light-years from Earth.
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