{"paper":{"title":"Spectral Variability and iron line emission in the ASCA Observations of the Seyfert 1 Galaxy NGC4051","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), (2) Cosmic Radiation Laboratory, Chiko Otani (2), Italy, Japan), Masaru Matsuoka (2) ((1) Unita' G.I.F.C.O.-C.N.R., Matteo Guainazzi (1, Palermo, RIKEN, Tatehiro Mihara (1), Wako-shi","submitted_at":"1996-10-23T12:11:19Z","abstract_excerpt":"We present the results of an extensive analysis of the ``ASCA'' AO2 observation of the Seyfert 1 galaxy NGC4051. The target exhibits broadband [0.5--10 keV] variability by a factor $\\sim 8$ on time scales $\\sim 10^4 s$, with a typical doubling time $\\sim 500 s$. The spectrum is characterized by a strong emission excess over the extrapolated power law at energies $E \\le 1 keV$. Absorption edges due to ionized oxygen species OVII and OVIII are detected together with an emission-like feature at $E \\sim 0.93 keV$. The OVII edge undergoes significant variability on a timescale as low as $\\sim 10^4 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9610180","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"}