Multi‐TeV Gamma‐Ray Flares from Markarian 421 in 2000 and 2001 Observed with the Tibet Air Shower Array

作者：M. Amenomori, S. Ayabe, S. W. Cui, Danzengluobu Danzengluobu, L. K. Ding, X. H. Ding, C. Feng, Z. Y. Feng, X. Y. Gao, Q. X. Geng, Hangwen Guo, H. H. He, M. He, K. Hibino, N. Hotta, Haibing Hu, H. B. Hu, J. Huang, Q. Huang, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, K. Kawata, Labaciren Labaciren, G. M. Le, J. Y. Li, H. Lu, S. L. Lu, X. R. Meng, K. Mizutani, J. Mu, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, T. Ouchi, S. Ozawa, J. R. Ren, T. Saito, M. Sakata, T. Sasaki, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, K. Taira, M. Takita, Y. H. Tan, N. Tateyama, S. Torii, H. Tsuchiya, S. Udo, Toshihiro Utsugi, Bosen Wang, H. Wang, Xiao Wang, Y. G. Wang, L. Xue, Y. Yamamoto, X. C. Yang, Z. H. Ye, G. C. Yu, A. F. Yuan, T. Yuda, Honglin Zhang, Jiaying Zhang, N. J. Zhang, X. Y. Zhang, Y. Zhang, Zhaxisangzhu, X. X. Zhou · 发表于：The Astrophysical Journal · 年份：2003 · DOI：10.1086/378350 · 被引用次数：74 · 研究领域：Astrophysics and Cosmic Phenomena、Solar and Space Plasma Dynamics、Dark Matter and Cosmic Phenomena

Several strong TeV γ-ray flares were detected from Mrk 421 in the years 2000 and 2001 by the Tibet III air shower array at a level of statistical significance of 5.1 σ. Mrk 421 was unprecedentedly active at X-ray and TeV γ-ray energies during this period, and a positive correlation was found between the change of the all-sky monitor Rossi X-Ray Timing Explorer X-ray flux and the Tibet TeV γ-ray flux. When a power-law energy spectrum for γ-rays from this source is assumed, the spectral index is calculated to be -3.24 ± 0.69 at the most active phase in 2001. The spectral index observed by the Tibet air shower array is consistent with those obtained via imaging air Cerenkov telescopes.