20.500.12556/RUL-165993 Formation of a low-mass galaxy from star clusters in a 600-million-year-old universe The most distant galaxies detected were seen when the Universe was a scant 5% of its current age. At these times, progenitors of galaxies such as the Milky Way were about 10,000 times less massive. Using the James Webb Space Telescope ( JWST) combined with magnification from gravitational lensing, these low-mass galaxies can not only be detected but also be studied in detail. Here we present JWST observations of a strongly lensed galaxy at zspec = 8.296 ± 0.001, showing massive star clusters (the Firefly Sparkle) cocooned in a diffuse arc in the Canadian Unbiased Cluster Survey (CANUCS)1. The Firefly Sparkle exhibits traits of a young, gas-rich galaxy in its early formation stage. The mass of the galaxy is concentrated in 10 star clusters (49–57% of total mass), with individual masses ranging from 105M⊙ to 106M⊙. These unresolved clusters have high surface densities (>103M⊙ pc−2), exceeding those of Milky Way globular clusters and young star clusters in nearby galaxies. The central cluster shows a nebular-dominated spectrum, low metallicity, high gas density and high electron temperature, hinting at a top-heavy initial mass function. These observations provide our first spectrophotometric view of a typical galaxy in its early stages, in a 600-million-year-old Universe. gravitational lensing early universe gravitacijsko lečenje zgodnje vesolje true false true Angleški jezik Slovenski jezik Članek v reviji 2024-12-16 14:32:07 2024-12-16 14:32:08 2025-02-20 11:42:47 0000-00-00 00:00:00 2024 0 0 5 str. issue 8042 Vol. 636 2024 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-12-11 524 0028-0836 10.1038/s41586-024-08293-0 219301891 s41586-024-08293-0-1.pdf s41586-024-08293-0-1.pdf 1 E469EC0E3EEAA40105B1ABFAAC3FB710 e2eafdd83d5c8922b1ae05a73076d5250ae0a3c8f15514df140acf33cdf33aa5 68cf8180-bbb5-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=197349 https://www.nature.com/articles/s41586-024-08293-0 0 8728ee51-ef76-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=199806 Fakulteta za matematiko in fiziko 0 0 0