{"paper":{"title":"MAGAZ3NE: Spatially Resolved Ages and Chemical Abundances of Ultra-Massive Quiescent Galaxies at z $\\sim$ 3.5 using JWST/NIRSpec IFU","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam Muzzin, Adit H. Edward, Aliza Beverage, Allison Noble, Aur\\'elien Henry, Ben Forrest, Danilo Marchesini, Gillian Wilson, Han Lei, Ian McConachie, Jacqueline Antwi-Danso, Massissilia L. Hamadouche, M. C. Cooper, M. E. Wisz, Percy Gomez, Stephanie M. Urbano Stawinski, Wenjun Chang","submitted_at":"2026-05-26T18:23:33Z","abstract_excerpt":"We present spatially-resolved measurements of stellar age, [Fe/H], and [$\\alpha$/Fe] in three ultra-massive ($\\rm{log(M_{\\ast}/M_{\\odot})>11}$), compact ($\\rm{R_e} \\lesssim 2$ kpc) quiescent galaxies at $z\\sim3.5$ using JWST/NIRSpec IFU spectroscopy. These observations provide the first spatially-resolved constraints on $\\alpha$-enhancement at this epoch, enabling a direct test of quenching mechanisms before late-time assembly processes such as mergers can erase chemical signatures. The central regions of all three galaxies show both uniformly young ages ($\\approx0.6-0.7$ Gyr) and elevated [$\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.27555","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/2605.27555/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"}