{"paper":{"title":"Long-term variability of the optical spectra of NGC 4151: II. Evolution of the broad Ha and Hb emission-line profiles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"A.I. Shapovalova, A. Kovacevic, A.N.Burenkov, D. Ilic, J. Leon-Tavares, L.C. Popovic, N.G. Bochkarev, V.H. Chavushyan","submitted_at":"2009-10-15T20:43:43Z","abstract_excerpt":"Results of the long-term (11 years, from 1996 to 2006) H$\\alpha$ and H$\\beta$ line variations of the active galactic nucleus of NGC 4151 are presented. High quality spectra (S/N>50 and R~8A) of H$\\alpha$ and H$\\beta$ were investigated. We analyzed line profile variations during monitoring period. Comparing the line profiles of H$\\alpha$ and H$\\beta$, we studied different details (bumps, absorption features) in the line profiles. The variations of the different H$\\alpha$ and H$\\beta$ line profile segments have been investigated. Also, we analyzed the Balmer decrement for whole line and for line"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.2980","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"}