The high activity of 3C 454.3 in autumn 2007

C M Raiteri,A Strigachev,M Villata,W.-S Hsiao,I Donnarumma,P Calcidese,G Umana,S Vercellone,L O Takalo,T Pursimo,L Lanteri,E Forné,E Marilli,M G Nikolashvili,M Tavani,A A Arkharov,B Ragozzine,E Nieppola,T P Krichbaum,C Thum,P Leto,P Charlot,E Ovcharov,M A Gurwell,David A Principe ,A Frasca,Chung-Uk Lee ,Alan P Marscher ,O M Kurtanidze,G Latev,Svetlana G Jorstad ,A C Sadun,F D’ammando ,C S Buemi,G N Kimeridze,E Angelakis,M Böttcher,C Trigilio,A E Volvach ,J.-F Le Campion,José L Gómez ,U Bach,H C Lin ,M Tornikoski,R Nesci,J Ohlert,A Valcheva,W P Chen,N Marchili,H Wiesemeyer,K Uckert,I Agudo,V M Larionov,M F Aller,L A Sigua,A Lähteenmäki,V A Hagen-Thorn,K Nilsson,H D Aller,L Fuhrmann,R L Smart

doi:10.1051/0004-6361:200809995

Abstract

Context. The quasar-type blazar 3C 454.3 underwent a phase of high activity in summer and autumn 2007 that was intensively monitored in the radio-to-optical bands by the Whole Earth Blazar Telescope (WEBT). The γ-ray satellite Astro-rivelatore Gamma a Immagini LEggero (AGILE) detected this source first in late July, and then in November–December 2007.

Full Text