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Abstract: We report first results of a multifrequency campaign from radio to hard X-rayenergies of the prominent gamma-ray blazar 3C 279, which was organised aroundan INTEGRAL ToO observation in January 2006, and triggered on its opticalstate. The variable blazar was observed at an intermediate optical state, and awell-covered multifrequency spectrum from radio to hard X-ray energies could bederived. The SED shows the typical two-hump shape, the signature of non-thermalsynchrotron and inverse-Compton IC emission from a relativistic jet. By thesignificant exposure times of INTEGRAL and Chandra, the IC spectrum 0.3 - 100keV was most accurately measured, showing - for the first time - a possiblebending. A comparison of this 2006 SED to the one observed in 2003, alsocentered on an INTEGRAL observation, during an optical low-state, reveals thesurprising fact that - despite a significant change at the high-energysynchrotron emission near-IR-optical-UV - the rest of the SED remainsunchanged. In particular, the low-energy IC emission X- and hard X-rayenergies remains the same as in 2003, proving that the two emission componentsdo not vary simultaneously, and provides strong constraints on the modelling ofthe overall emission of 3C 279.

Autor: WEBT Collaboration: W. Collmar, M. Böttcher, T. Krichbaum, E. Bottacini, V. Burwitz, A. Cucchiara, D. Grupe, M. Gurwell, P. Kret


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