20.500.12556/RUL-178340 Star formation under a cosmic microscope: highly magnified z = 11 galaxy behind the bullet cluster We present measurements of stellar population properties of a newly discovered, spectroscopically confirmed, $z=11.10^{+0.11}_{-0.26}$, gravitationally lensed galaxy, using JWST NIRSpec PRISM spectroscopy and NIRCam imaging. The arc is highly magnified by the Bullet Cluster (magnification factor $\mu=14.0^{+6.2}_{-0.3}$). It contains three star-forming components of which one is barely resolved and two are unresolved, giving intrinsic sizes of $\lesssim 10$ pc. The clumps also contain $\sim 50\%$ of the total stellar mass. The galaxy formed the majority of its stars $\sim 150$ Myr ago (by $z \sim 14$). The spectrum shows a pronounced damping wing, typical for galaxies deep in the reionization era and indicating a neutral intergalactic medium at this line of sight. The intrinsic luminosity of the galaxy is $0.086^{+0.008}_{-0.030} L^*$ (with $L^*$ being the characteristic luminosity for this redshift), making it the lowest-luminosity spectroscopically confirmed galaxy at $z > 10$ discovered to date. galaxies gravitational lensing spectroscopy photometry galaksije gravitacijsko lečenje spektroskopija fotometrija true false true Angleški jezik Slovenski jezik Članek v reviji 2026-01-23 11:15:49 2026-01-23 11:15:49 2026-01-24 04:32:40 0000-00-00 00:00:00 2025 0 0 8 str. no. 2, art. no. L74 Vol. 995 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 524.8 2041-8213 10.3847/2041-8213/ae27d2 265898243 Bradac_2025_ApJL_995_L74.pdf Bradac_2025_ApJL_995_L74.pdf 1 39BCDB2CAE80244687DF9DD97521613E 7c73661aee94a4876aa09fe90741732c400b28df2cb08647f43d1f6edf0df01f 25848dee-f846-11f0-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226104 https://iopscience.iop.org/article/10.3847/2041-8213/ae27d2 0 2bacef1e-f846-11f0-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226105 Fakulteta za matematiko in fiziko 0 0 0