The newly released dataset, which represents less than 0.5 percent of Euclid's intended sky coverage, has already enabled numerous breakthroughs, especially among UK researchers. Scientists from the University of Edinburgh are at the forefront, coordinating the UK's data analysis efforts and managing the UK Science Data Centre for Euclid. Their team handles the satellite's massive data flow, processing it for use by the global Euclid Consortium.
Among the early results is a study of gravitational lensing, led by teams from the Universities of Oxford, Portsmouth, and Newcastle. Through a mix of artificial intelligence and contributions from over 1,000 citizen scientists via the Space Warps initiative on Zooniverse, researchers analyzed more than one million galaxies. They identified 500 potential strong gravitational lens candidates. These rare cosmic events, where massive objects bend light into arcs or rings, offer insights into the structure of the cosmos. Even rarer are dual-lens systems, where two galaxies are warped by a single object. Four such systems were discovered, aiding efforts to map the Universe's architecture.
"These lenses are already allowing us to learn about our Universe, but this is just the beginning for Euclid. The full Euclid survey will be a revolution for strong lensing," said Natalie Lines, PhD student at the University of Portsmouth.
In another study, Lancaster University astronomers used Euclid's capabilities to examine transient celestial phenomena like supernovae. Euclid's power allows scientists to observe these stellar explosions and their host galaxies long after they have faded from Earth-based observatories.
"It is amazing to use Euclid to be able to see transients and their host galaxies in such spectacular detail, especially well before and after we would otherwise be able to see them from observatories searching for supernova here on Earth. This will allow us to increase our understanding of supernova and where they came from," said Dr Chris Duffy of Lancaster University.
Research on active galactic nuclei (AGN) has also benefited. The Euclid-AGN team, including researchers at the University of Bristol, found numerous supermassive black holes at the centers of galaxies consuming surrounding gas. These AGNs, though comprising less than 10 percent of galaxies, are crucial to understanding galactic evolution. The findings, led by PhD student Teresa Matamoro-Zatarain, combine Euclid observations with other multi-wavelength surveys.
UK involvement in Euclid extends beyond data analysis. University College London's Mullard Space Science Laboratory led the creation of the satellite's visible light camera (VIS). Additionally, seven UK universities contributed to the Science Ground Segment, converting raw satellite data into usable scientific material.
A major data release is scheduled for October 2026, promising new insights into dark energy.
"These latest results show just how powerful Euclid is for astronomy and how fantastically its data analysis pipeline is working, with such high-quality data over huge areas of the sky. The strong lensing results in particular, led by UK teams, are a huge advance of previous analysis. It has been a lot of hard work over many years to develop, but the results are amazing," said Professor Andy Taylor, University of Edinburgh.
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