GeV-TeV γ-ray energy spectral break of BL Lac objects

作     者：Zhong, W. Liu, W.G. Zheng, Y.G. 

作者机构：Department of Physics Yunnan Normal University Kunming650092 China Yunnan Observatories Chinese Academy of Sciences Kunming650011 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming650011 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2018年

核心收录：

主　　题：Regression analysis 

摘      要：In this paper, we compile the very-highenergy and high-energy spectral indices of 43 BL Lac objects from the literature. Based on a simple math model, ΔΓobs= αz + β, 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, ΔΓobs. We find by linear regression analysis that α ≠ 0 and β ≠ 0. These results suggest that the extragalactic background light attenuation and the intrinsic curvature dominate on the GeV-TeV γ-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. Copyright © 2018, The Authors. All rights reserved.