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Abstract: Among the blazars detected by the Fermi satellite, we have selected the 23blazars that in the three months of survey had an average gamma-ray luminosityabove 1e48 erg-s. For 17 out of the 23 sources we found and analysed X-ray andoptical-UV data taken by the Swift satellite. With these data, implemented byarchival and not simultaneous data, we construct the spectral energydistributions, and interpreted them with a simple one-zone, leptonic,synchrotron and inverse Compton model. When possible, we also compare differenthigh energy states of single sources, like 0528+134 and 3C 454.3, for whichmultiple good sets of multi-wavelength data are available. In our powerfulblazars the high energy emission always dominates the electromagnetic output,and the relatively low level of the synchrotron radiation often does not hidethe accretion disk emission. We can then constrain the black hole mass and thedisk luminosity. Both are large i.e. masses equal or greater than 1e9 solarmasses and disk luminosities above 0.1 Eddington. By modelling the non-thermalcontinuum we derive the power that the jet carries in the form of bulk motionof particles and fields. On average, the jet power is found to be slightlylarger than the disk luminosity, and proportional to the mass accretion rate.



Autor: G. Ghisellini, F. Tavecchio, G. Ghirlanda INAF-OABrera, Merate, Italy

Fuente: https://arxiv.org/







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