{"paper":{"title":"A massive barred spiral galaxy at z = 5.102 discovered by JWST","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adi Zitrin, Anton M. Koekemoer, Brenda L. Frye, Cheng cheng, Chian-Chou Chen, Christopher J. Conselice, Daneil Espada, Fengwu Sun, Hideki Umehata, Jean-Baptiste Jolly, Kotaro Kohno, Mingyu Li, Miroslava Dessauges-Zavadsky, Nicholas Martis, Rogier A. 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 $144\\,\\rm M_\\odot/yr$. A concentrated bulge is embedded in an extended disk with a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.25022","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.25022/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}