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Unavoidable but unobserved marks: The hump in the synchrotron component

Current view: The GeV emission of blazars is external Compton (EC) scattering off the broad line region (BLR) photons. 2. 1. Unavoidable but unobserved marks: The hump in the synchrotron component 2. The flat/rising SED of the GeV component

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Unavoidable but unobserved marks: The hump in the synchrotron component

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  1. Current view: The GeV emission of blazars is external Compton (EC) scattering off the broad line region (BLR) photons 2 1 • Unavoidable but unobserved marks: • The hump in the synchrotron component • 2. The flat/rising SED of the GeV component • 3. Achromatic variability for the synchrotron hump and the GeV regime. 3 Cooling time as a function of electron energy

  2. What is it then?Multiple order SSCthat DOES produce superquadratic variations How can it not be EC off the BLR?A Flat BLR reduces the EC flux by up to ~ Γ4 ~10,000 1

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