Abstract
The TeV gamma-ray spectra of some BL Lacs, after being corrected for intergalactic absorption in the extragalactic background light (EBL), appears unusually hard. This finding poses challenges to conventional acceleration and emission models. We analyze the constraints to produce such hard TeV spectra within a time-dependent, leptonic synchrotron-Compton approach, utilizing a narrow, very energetic electron distribution.
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