Euclid discovers the most ancient quasars in the universe
The European Space Agency's Euclid space telescope has discovered 31 of the most ancient quasars ever found. Two of these giant and dazzling galaxy cores, powered by gargantuan black holes, are the ea
The European Space Agency's Euclid space telescope has discovered 31 of the most ancient quasars ever found. Two of these giant and dazzling galaxy co
Read Full Story at Phys.org →Why This Matters
The discovery of 31 ancient quasars by Euclid reshapes our understanding of the early universe, offering a direct glimpse into the cosmic dawn when galaxies first ignited. These behemoths—powered by black holes billions of times the mass of our Sun—challenge existing models of black hole formation and galaxy evolution, forcing astronomers to reconsider how such extreme structures could emerge in the universe’s infancy.
Background Context
Quasars, the ultra-luminous cores of distant galaxies, were once thought to be rare relics of the early cosmos, detectable only in deep-field surveys. Yet Euclid’s wide-field capabilities have upended this assumption, proving that these cosmic lighthouses are far more common in the early universe than previously believed. The mission’s infrared sensitivity also sidesteps the limitations of ground-based telescopes, which struggle to peer through Earth’s atmosphere to observe these ancient objects.
What Happens Next
Follow-up observations with ground-based telescopes and the James Webb Space Telescope will scrutinize these quasars to measure their redshift—precise data that will refine estimates of their age and distance. If confirmed as among the earliest known, they could become benchmarks for studying the intergalactic medium and the role of black holes in shaping the universe’s first galaxies. Meanwhile, Euclid’s survey will likely uncover even more ancient quasars, potentially doubling the known population.
Bigger Picture
This discovery aligns with a broader shift in astrophysics toward studying the universe’s first billion years, a period once shrouded in mystery. As next-generation telescopes like Euclid, the Vera C. Rubin Observatory, and the Nancy Grace Roman Space Telescope come online, the detection of such ancient quasars may become routine—transforming our understanding of cosmic dawn from a theoretical puzzle into an observational science.
