OBSERVATION OF TeV GAMMA RAYS FROM THE UNIDENTIFIED SOURCE HESS J1841–055 WITH THE ARGO-YBJ EXPERIMENT

作者：B. Bartoli, P. Bernardini, X. J. Bi, I. Bolognino, P. Branchini, A. Budano, A. K. Calabrese Melcarne, P. Camarri, Z. Cao, R. Cardarelli, S. Catalanotti, Claudio Cattaneo, S. Z. Chen, T. L. Chen, Yupeng Chen, P. Creti, S. W. Cui, B. Z. Dai, G. D’Alí Staiti, A. D׳Amone, Danzengluobu Danzengluobu, I. De Mitri, B. D′Ettorre Piazzoli, T. Di Girolamo, X. H. Ding, G. Di Sciascio, C. Feng, Zhaoyang Feng, Zhenyong Feng, F. Galeazzi, E. Giroletti, Q. B. Gou, Yi-Qing Guo, H. H. He, Haibing Hu, Hongbo Hu, Q. Huang, M. Iacovacci, R. Iuppa, I. James, H. Y. Jia, Labaciren Labaciren, H. J. Li, J. Y. Li, X. X. Li, G. Liguori, C. Liu, C. Q. Liu, J. Liu, M. Y. Liu, H. Lu, L. L., Xinhua Ma, G. Mancarella, S. M. Mari, G. Marsella, D. Martello, S. Mastroianni, P. Montini, C. C. Ning, A. Pagliaro, M. Panareo, B. Panico, Lorenzo Perrone, P. Pistilli, F. Ruggieri, P. Salvini, R. Santonico, S. N. Sbano, P. R. Shen, X. D. Sheng, F. Shi, A. Surdo, Y. H. Tan, P. Vallania, S. Vernetto, C. Vigorito, Bo Wang, H. Wang, C. Y. Wu, H. Wu, Benda Xu, L. Xue, Q. Y. Yang, X. C. Yang, Z. G. Yao, A. F. Yuan, M. Zha, Honglin Zhang, Jilong Zhang, Jianli Zhang, Li Zhang, P. Zhang, X. Y. Zhang, Yi Zhang, J. Zhao, Zhaxiciren Zhaxiciren, Zhaxisangzhu, X. X. Zhou, F. R. Zhu, Q. Q. Zhu, G. Zizzi · 发表于：The Astrophysical Journal · 年份：2013 · DOI：10.1088/0004-637x/767/2/99 · 被引用次数：30 · 研究领域：Astrophysics and Cosmic Phenomena、Astrophysical Phenomena and Observations、Pulsars and Gravitational Waves Research

We report the observation of a very high energy γ-ray source whose position is coincident with HESS J1841−055. This source has been observed for 4.5 years by the ARGO-YBJ experiment from 2007 November to 2012 July. Its emission is detected with a statistical significance of 5.3 standard deviations. Parameterizing the source shape with a two-dimensional Gaussian function, we estimate an extension , which is consistent with the HESS measurement. The observed energy spectrum is dN / dE = (9.0 ± 1.6) × 10 −13 ( E /5 TeV) −2.32 ± 0.23 photons cm −2 s −1 TeV −1 , in the energy range 0.9–50 TeV. The integral γ-ray flux above 1 TeV is 1.3 ± 0.4 Crab, which is 3.2 ± 1.0 times the flux derived by HESS. The differences in the flux determination between HESS and ARGO-YBJ and possible counterparts at other wavelengths are discussed.