{"paper":{"title":"Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. III. Optical Observations and the Optical--UV--X-ray Connection","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.V.Filippenko, B.M.Peterson, B.W.Peterson, C.J.Taylor, C.M.Gaskell, E.A.Sergeeva, E.Detsis, E.S.Klimek, G.M.Stirpe, H.Negoro, H.Netzer, I.Papadakis, I.Papamastorakis, K.A.Crowley, K.S.Rumstay, K.von Braun, M.E.Hiller, M.Gliozzi, M.H.Lannon, M.Vestergaard, O.Shemmer, P.Martini, P.Romano, P.Uttley, R.Bertram, R.M.Wagner, R.R.Treffers, R.W.Pogge, S.Collier, S.G.Sergeev, S.Kaspi, S.Mathur, T.A.George, T.J.Turner, T.L.Jewell, V.I.Pronik, W.Brinkmann, W.Li, Z.Zheng","submitted_at":"2001-07-04T14:00:11Z","abstract_excerpt":"We present the results of a two-year long optical monitoring program of the narrow-line Seyfert 1 galaxy Akn 564. The majority of this monitoring project was also covered by X-ray observations (RXTE) and for a period of ~50 days, we observed the galaxy in UV (HST) and X-rays (RXTE & ASCA) simultaneously with the ground-based observations. Rapid and large-amplitude variations seen in the X-ray band, on a daily and hourly time-scale, were not detected at optical and UV wavelengths, which in turn exhibited much lower variability either on short (one day) or long (several months) time-scales. The "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0107075","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0107075/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}