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Paper: Long-Term γ-ray and Multi Wavelength Observations of 3C 454.3 (a.k.a. the Crazy Diamond)
Volume: 427, Accretion and Ejection in AGN: a Global View
Page: 257
Authors: Vercellone, S., AGILE Team
Abstract: During the period July 2007 - January 2009, the AGILE satellite, together with several other space- and ground-based observatories monitored the activity of the flat-spectrum radio quasar 3C 454.3, yielding the longest multiwavelength coverage of this γ-ray quasar so far. The source underwent an unprecedented period of very high activity above 100 MeV, a few times reaching γ-ray flux levels on a day time scale higher than F=400×10–8 photons cm-2 s-1, in conjunction with an extremely variable behavior in the optical R-band, even of the order of several tenth of magnitude in few hours, as shown by the GASP-WEBT light curves. We present the results of this long term multiwavelength monitoring campaign, with particular emphasis on the study of possible lags between the different wavebands, and the results of the modeling of simultaneous spectral energy distributions at different levels of activity.
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