The long-lasting activity of 3C 454.3 GASP-WEBT and satellite observations in 2008-2010

: Raiteri CM, Villata M, Aller MF, Gurwell MA, Kurtanidze OM, Lahteenmaki A, Larionov VM, Romano P, Vercellone S, Agudo I, Aller HD, Arkharov AA, Bach U, Benitez E, Berdyugin A, Blinov DA, Borisova EV, Bottcher M, Calle OJAB, Buemi CS, Calcidese P, Carosati D, Casas R, Chen WP, Efimova NV, Gomez JL, Gusbar C, Hawkins K, Heidt J, Hiriart D, Hsiao HY, Jordan B, Jorstad SG, Joshi M, Kimeridze GN, Koptelova E, Konstantinova TS, Kopatskaya EN, Kurtanidze SO, Larionova EG, Larionova LV, Leto P, Li Y, Ligustri R, Lindfors E, Lister M, Marscher AP, Molina SN, Morozova DA, Nieppola E, Nikolashvili MG, Nilsson K, Palma N, Pasanen M, Reinthal R, Roberts V, Ros JA, Roustazadeh P, Sadun AC, Sakamoto T, Schwartz RD, Sigua LA, Sillanpaa A, Takalo LO, Tammi J, Taylor B, Tornikoski M, Trigilio C, Troitsky IS, Umana G, Volvach A, Yuldasheva TA

Publisher: EDP SCIENCES S A

: 2011

: Astronomy and Astrophysics

: ASTRONOMY & ASTROPHYSICS

: ASTRON ASTROPHYS

: ARTN A87

: 534

: 87

: 102

: 16

: 0004-6361

DOI: https://doi.org/10.1051/0004-6361/201117026

Conclusions. We interpret the multifrequency behaviour in terms of an inhomogeneous curved jet, where synchrotron radiation of increasing wavelength is produced in progressively outer and wider jet regions, which can change their orientation in time. In particular, we assume that the long-term variability is due to this geometrical effect. By combining the optical and mm light curves to fit the gamma and X-ray ones, we find that the gamma (X-ray) emission may be explained by inverse-Comptonisation of synchrotron optical (IR) photons by their parent relativistic electrons (SSC process). A slight, variable misalignment between the synchrotron and Comptonisation zones would explain the increased gamma and X-ray flux levels in 2009-2010, as well as the change in the gamma/optical flux ratio during the outbursts peaks. The time delays of the X-ray flux changes after the gamma, and optical ones are consistent with the proposed scenario.