{"paper":{"title":"ULIRGs: Origin and Evolution","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"CSIC), I. Marquez, J. Maegosa (Instituto de Astrofisica de Andalucia","submitted_at":"2002-03-22T13:02:43Z","abstract_excerpt":"We present our preliminary results on the study of the high luminosity ULIRGs (log(LFIR) > 12.3) in the 1Jy sample. Deep, high resolution optical R images with 7 arcmin x 7 arcmin field of view for 2/3 of the whole sample, show that they are generally found in very rich environments, they seem to be late stage merger products (long tidal tails are found in only 3 systems) and all of them show multiple nuclei (double nuclei in 11: 2HII, 4 LINERs, 4 Sy2 and 1 Sy1). GTC first light instruments are very well suited for addressing the question of the energy source of ULIRGs, together with a more re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0203398","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"}