GeV-TeV $\gamma$-ray energy spectral break of BL Lac objects

W. Zhong, W. G. Liu, Y. G. Zheng

In this paper, we compile the very-high-energy and high-energy spectral indices of 43 BL Lac objects from the literature. Based on a simple math model, $\Delta {\Gamma }_{obs}=\alpha \mathrm{z}+\beta$, we p…