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<i>INTEGRAL</i> observations of the blazar 3C 454.3 in outburst

E. PianINAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, 34131 Trieste, Italy e-mail: [email protected]L. FoschiniINAF, IASF-Bologna, via Gobetti 101, 40129 Bologna, ItalyV. BeckmannJoint Center for Astrophysics, Department of Physics, University of Maryland, Baltimore County, MD 21250, USAS. SoldiObservatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, SwitzerlandM. TürlerINTEGRAL Science Data Center, Chemin d'Écogia 16, 1290 Versoix, SwitzerlandN. GehrelsNASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, USAG. GhiselliniINAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyP. GiommiL. MaraschiINAF, Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, ItalyT. PursimoNordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, SpainC. M. RaiteriINAF, Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), ItalyG. TagliaferriINAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyM. TornikoskiMetsähovi Radio Observatory, Metsähovintie 114, 02540 Kylmälä, FinlandG. TostiDipartimento di Fisica, University of Perugia, via A. Pascoli, 06123 Perugia, ItalyA. TrevesDipartimento di Fisica e Matematica, University of Insubria, via Valleggio 11, 22100 Como, ItalyM. VillataINAF, Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), ItalyP. BarrESA-ESTEC, RSSD, Keplerlaan 1, Postbus 299, 2200 AG Noordwijk, The NetherlandsT. J.-L. CourvoisierINTEGRAL Science Data Center, Chemin d'Écogia 16, 1290 Versoix, SwitzerlandG. Di CoccoINAF, IASF-Bologna, via Gobetti 101, 40129 Bologna, ItalyR. HudecAstronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ondrejov, Czech RepublicL. FuhrmannDipartimento di Fisica, University of Perugia, via A. Pascoli, 06123 Perugia, ItalyG. MalagutiINAF, IASF-Bologna, via Gobetti 101, 40129 Bologna, ItalyM. PersicINAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, 34131 Trieste, Italy e-mail: [email protected]F. TavecchioINAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyR. WalterINTEGRAL Science Data Center, Chemin d'Écogia 16, 1290 Versoix, Switzerland

2006en

ABI

Annotatsiya

In Spring 2005, the blazar 3C 454.3 underwent a dramatic outburst at all wavelengths from mm to X-rays. This prompted INTEGRAL observations, accomplished in 15-18 May 2005. The source was detected by the INTEGRAL instruments from 3 to 200 keV in a bright state ( erg s-1 cm-2), at least a factor of 2-3 higher than previously observed. This is one of the brightest blazar detections achieved by INTEGRAL. During the 2.5 days of INTEGRAL monitoring, we detected a ~20% decrease in the hard X-rays (20-40 keV), indicating that we have sampled the decaying part of the flare. The decrease is less apparent in the soft X-rays (5-15 keV). The simultaneous optical variations are weakly correlated with those at soft X-rays, and not clearly correlated with those at hard X-rays. The spectral energy distribution exhibits two components, as typically seen in blazars, which can be modeled with synchrotron radiation and inverse Compton scattering occurring in a region external to the broad line region.

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DOI: 10.1051/0004-6361:200600017

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