{"paper":{"title":"Physical Conditions in the Broad Line Region of $z\\sim3$ Quasars: A Photoionization Method to Derive $r_{BLR}$","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C. Alenka Negrete, Deborah Dultzin, Jack Sulentic, Paola Marziani","submitted_at":"2010-11-18T18:22:28Z","abstract_excerpt":"We present high S/N UV spectra for eight quasars at $z\\sim3$\\ obtained with VLT/FORS. The spectra enable us to analyze in detail the strongest emission features in the rest-frame range 1400-2000 \\AA\\ of each source (\\ciii, \\siiii, \\aliii, \\siii, \\civ\\ and \\siiv). Previous work indicates that a component of these lines is emitted in a region with well-defined properties i.e., a high density and low ionization emitting region). Flux ratios \\aliii/\\siiii, \\civ/\\aliii, \\siiv/\\siiii, \\civ/\\siiv\\ and \\siii/\\siiii\\ for this region permit us to strongly constrain electron density, ionization parameter"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.4248","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"}