The European Space Agency’s (ESA) Euclid space telescope has identified 31 quasars, including the two oldest known to date. According to a study published in Astronomy & Astrophysics, these ancient objects date back to when the universe was 670 million years old, challenging existing astrophysical models regarding how supermassive black holes grow so rapidly in the early cosmos.
How Euclid is Changing Deep Space Observation
The discovery of these 31 quasars effectively doubles the number of known ancient quasars in just two years. Daming Yang, a doctoral candidate at Leiden University and the study’s lead author, stated that Euclid has “transformed the field” of observational astronomy. Before the telescope’s launch in 2023, researchers relied on ground-based observatories to track these distant, luminous objects. By operating from space, Euclid has “transformed the field,” according to Daming Yang.
Quasars are the active nuclei of primitive galaxies. They are powered by supermassive black holes that pull in surrounding matter, creating a luminosity that can outshine trillions of suns.
Why These Quasars Challenge Current Theories
The existence of such massive objects in the early universe poses a significant problem for current cosmological theories. Co-author Joseph Hennawi noted that these “monsters”—some possessing a mass several billion times that of the Sun—appeared when the universe was in its infancy. Standard models struggle to explain how these black holes accumulated such immense mass in such a short timeframe. As telescopes like Euclid and the James Webb Space Telescope (JWST) look further back in time, they consistently reveal galaxies and structures that appear more evolved than current models predict for that stage of cosmic history.
Using Quasars as Cosmic Beacons
Scientists are utilizing these newly discovered quasars as “beacons” to map the history of the universe. According to Daming Yang, these objects allow researchers to study the gas located between the quasars and Earth. This analysis is vital for understanding the epoch of reionization, a period when the first stars and galaxies formed and began clearing the “cosmic fog” that permeated the early universe. By tracking the light from these quasars, astronomers can reconstruct the timeline of this transformation.
Comparative Timeline of Quasar Discoveries
- 2021: The same research team announced the discovery of the oldest quasar known until now.
- Euclid findings: Euclid’s recent findings identified quasars existing 20 million years earlier than the previous record-holder.
- Future Goal: Researchers are now targeting quasars from when the universe was 630 million years old to further refine the “chronicle of the first billion years.”
Follow updates from the European Space Agency (ESA) and the Astronomy & Astrophysics journal to stay informed on the next phase of the Euclid mission, which will integrate data from the James Webb Space Telescope.
Frequently Asked Questions
What is a quasar?
A quasar is the center of a primitive galaxy, powered by a supermassive black hole that is consuming surrounding matter.
Why do scientists look for older quasars?
Finding older quasars helps researchers understand the early ages of the universe.
How does Euclid differ from previous telescopes?
Euclid, launched in 2023, has “transformed the field” of tracking ancient quasars compared to ground-based telescopes used previously.
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