{"paper":{"title":"The Deep2 Galaxy Redshift Survey: Evolution of Close Galaxy Pairs and Major-Merger Rates Up to z ~ 1.2","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), (2) UCO/LICK & UC Santa Cruz, (3) Trent University, (4) Caltech, (5) UC Berkeley, (6) Hubble Fellow; Lawrence Berkeley National Laboratory), Alison L. Coil (5), Brian F. Gerke (5), Christopher J. Conselice (4), Christopher N. A. Willmer (2), David C. Koo (2), David R. Patton (3), Jeffrey A. Newman (6) ((1) National Taiwan University, Lihwai Lin (1, Marc Davis (5), Michael C. Cooper (5), Puragra Guhathakurta (2), Renbin Yan (5), S. M. Faber (2)","submitted_at":"2004-11-04T08:12:30Z","abstract_excerpt":"We derive the close, kinematic pair fraction and merger rate up to z ~ 1.2 from the initial data of the DEEP2 Redshift Survey. Assuming a mild luminosity evolution, the number of companions per luminous galaxy is found to evolve as (1+z)^{m}, with m = 0.51+-0.28; assuming no evolution, m = 1.60+-0.29. Our results imply that only 9% of present-day $L^{*}$ galaxies have undergone major mergers since z ~ 1.2 and that the average major merger rate is about 4* 10^{-4} h^{3} Mpc^{-3} Gyr^{-1} for z ~ 0.5 - 1.2. Most previous studies have yielded higher values."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0411104","kind":"arxiv","version":2},"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"}