Abstract
We present statistical analyses of large homogenous data sample of Fermi-detected blazars thoroughly studied in order to reassess the relationship between flat-spectrum radio quasars (FSRQs) and subclasses of BL Lacertae objects (BL Lacs) blazar populations. We discovered from the average values of γ-ray (αγ−ray) and X-ray (αX−ray) spectral indices that the sequence of distribution is indicative of blazar unification scheme. Analyses of FSRQs and BL Lacs data show difference in the shape of γ-ray and X-ray spectral indices: significant anti-correlation (r> - 0.79) exists between αγ−ray and αX−ray spectral indices. The spectral energy distributions of the blazar subclasses show that FSRQs and BL Lacs have similar spectral properties which can be unified through evolutionary sequence. Nevertheless, there is a significant difference between the shapes of X-ray and γ-ray spectra of blazars suggestive that different mechanisms are responsible for spectral variations in the two energy bands. All these results suggest that there is a form of a unified scheme for all blazars.
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