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Euclid finds complete Einstein Ring in NGC galaxy
A space mission to map the Dark Universe
Follow-up spectroscopy with the Keck telescope on Hawaii and its KCWI integral-field spectrograph showed the source galaxy to lie at redshift z=0.406, or about 4.5 billion light-years distance from us. With the peculiar structure of the right it was quickly clear that this must be the case of strong gravitational lensing, and the ring was actually not part of NGC 6505 but the distorted image of a background galaxy. Simulation show that the chance for finding a lens at this distance with the brighness that is seen in NGC 6505 was computed 1 in 2000 – and between 4 and 20 further nearby lenses are predicted to still be found in Euclid’s Wide Survey over the next years.
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