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Windhorst, Shude Mao, Sijia Cai, Weichen Wang, Wenlei Chen, Xiaohan Wang, Xiaojing Lin, Yoshihisa Asada, Yunjing Wu, Zheng Cai","submitted_at":"2026-06-23T18:00:01Z","abstract_excerpt":"We report M1149-BSG-z5, a barred spiral galaxy at $z = 5.102$, identified in the parallel field of MACS J1149+2223 with JWST and HST. M1149-BSG-z5 is the highest redshift barred galaxy candidate to date. Both isophote ellipse fitting and structural modeling support a stellar bar of length $a_\\mathrm{bar} \\approx 4.5$ kpc, and extended spiral arms peaking at $r \\approx 5.5$ kpc. M1149-BSG-z5 is a massive main sequence star-forming galaxy, with a stellar mass of $10^{10.45}\\rm M_\\odot$ and a star-formation rate of $144\\,\\rm M_\\odot/yr$. 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