{"paper":{"title":"The Evolutionary Status of Clusters of Galaxies at z ~ 1","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"B.P. Holden, G. Illingworth, H. Ford, J.P. Blakeslee, M.J. Jee, M. Postman, N. Homeier, P. Rosati, R. Demarco, R.L. White","submitted_at":"2004-08-09T21:45:34Z","abstract_excerpt":"Combined HST, X-ray, and ground-based optical studies show that clusters of galaxies are largely \"in place\" by $z \\sim 1$, an epoch when the Universe was less than half its present age. High resolution images show that elliptical, S0, and spiral galaxies are present in clusters at redshifts up to $z \\sim 1.3$. Analysis of the CMDs suggest that the cluster ellipticals formed their stars several Gyr earlier, near redshift 3. The morphology--density relation is well established at $z\\sim1$, with star-forming spirals and irregulars residing mostly in the outer parts of the clusters and E/S0s conce"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0408165","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":""},"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"}