GeV-TeV $\gamma $-ray energy spectral break of BL Lac objects |
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| Authors: | W Zhong W G Liu Y G Zheng |
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| Institution: | 1.Department of Physics,Yunnan Normal University,Kunming,China;2.Yunnan Observatories,Chinese Academy of Sciences,Kunming,China;3.Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming,China |
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| Abstract: | 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, \(\Delta \Gamma_{obs}= \alpha {{{z}}}+\beta \), we present evidence for the origin of an observed spectral break that is denoted by the difference between the observed very-high-energy and high-energy spectral indices, \(\Delta \Gamma_{obs}\). We find by linear regression analysis that \(\alpha \ne 0\) and \(\beta \ne 0\). These results suggest that the extragalactic background light attenuation and the intrinsic curvature dominate on the GeV-TeV \(\gamma \)-ray energy spectral break of BL Lac objects. We argue that the extragalactic background light attenuation is an exclusive explanation for the redshift evolution of the observed spectral break. |
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