Abstract
Using γ-ray band data detected by Fermi Large Area Telescope (LAT) and X-ray band data for 78 blazars, we find a medium correlation between X-ray and γ-ray fluxes in the average state. A medium anticorrelation is also found between X-ray (1KeV) mean spectral index αx and γ-ray mean spectral index αγ for blazars. Our results suggest that the most likely radiation mechanism for the high energy γ-ray would be SSC. And that the γ-ray emission mechanism may be somewhat different for BL Lacs and FSRQs.
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