naa a22 4500 510731961 CHVBK 20180411082956.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1134/S1063772912120098 doi (NATIONALLICENCE)springer-10.1134/S1063772912120098 A prolonged flare in the blazar 3C 454.3 [Elektronische Daten] [A. Vol'vach, A. Kutkin, M. Larionov, L. Vol'vach, A. Lahteenmaki, M. Tornikoski, J. Tammi, J. Léon-Tavares, E. Järvelä, M. Aller, H. Aller] We present an analysis of data from multi-frequency monitoring of the blazar 3C 454.3 in 2010-2012, when the source experienced an unusually prolonged flare with a duration of about two years. This corresponds to the orbital period of the companion in a scenario in which two supermassive black holes are present in the nucleus of 3C 454.3. The flare's shape, duration, and amplitude can be explained as a result of precession, if the plane of the accretion disk and the orbital plane of the binary are coincident. We detected small-scale structure of the flare, on time scales of no more than a month. These features probably correspond to inhomogeneities in the accretion disk and surrounding regions, with sizes of the order of 1015 cm. We estimated the size of the accretion disk based on the dynamical and geometrical parameters of this binary system: its diameter is comparable to the size of the orbit of the supermassive binary black hole, and its thickness does not exceed the gravitational radius of the central black hole. The presence of characteristic small-scale features during the flare makes it possible to estimate the relative time delays of variations in different spectral ranges: from gamma-ray to millimeter wavelengths. Pleiades Publishing, Ltd., 2013 Vol'vach A. Radio Astronomy Laboratory of the Crimean Astrophysical Observatory, 98688, Katsiveli, Crimea, Ukraine aut Kutkin A. Astro Space Center, P.N. Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Larionov M. Astro Space Center, P.N. Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Vol'vach L. Radio Astronomy Laboratory of the Crimean Astrophysical Observatory, 98688, Katsiveli, Crimea, Ukraine aut Lahteenmaki A. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut Tornikoski M. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut Tammi J. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut Léon-Tavares J. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut Järvelä E. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut Aller M. Astronomy Department, University of Michigan, 48109-1120, Ann Arbor, MI, USA aut Aller H. Astronomy Department, University of Michigan, 48109-1120, Ann Arbor, MI, USA aut Astronomy Reports SP MAIK Nauka/Interperiodica 57/1(2013-01-01), 46-51 1063-7729 57:1<46 2013 57 11444 https://doi.org/10.1134/S1063772912120098 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772912120098 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vol'vach A. Radio Astronomy Laboratory of the Crimean Astrophysical Observatory, 98688, Katsiveli, Crimea, Ukraine aut NATIONALLICENCE 700 1- Kutkin A. Astro Space Center, P.N. Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Larionov M. Astro Space Center, P.N. Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Vol'vach L. Radio Astronomy Laboratory of the Crimean Astrophysical Observatory, 98688, Katsiveli, Crimea, Ukraine aut NATIONALLICENCE 700 1- Lahteenmaki A. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut NATIONALLICENCE 700 1- Tornikoski M. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut NATIONALLICENCE 700 1- Tammi J. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut NATIONALLICENCE 700 1- Léon-Tavares J. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut NATIONALLICENCE 700 1- Järvelä E. Metsähovi Radio Observatory, Aalto University, Metsähovintie 114, 02540, Kylmälä, Finland aut NATIONALLICENCE 700 1- Aller M. Astronomy Department, University of Michigan, 48109-1120, Ann Arbor, MI, USA aut NATIONALLICENCE 700 1- Aller H. Astronomy Department, University of Michigan, 48109-1120, Ann Arbor, MI, USA aut NATIONALLICENCE 773 0- Astronomy Reports SP MAIK Nauka/Interperiodica 57/1(2013-01-01), 46-51 1063-7729 57:1<46 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer