OBSERVATION OF THE TeV GAMMA-RAY SOURCE MGRO J1908+06 WITH ARGO-YBJ
- Autori: Bartoli, B; Bernardini, P; Bi, XJ; Bleve, C; Bolognino, I; Branchini, P; Budano, A; Calabrese Melcarne, AK; Camarri, P; Cao, Z; Cardarelli, R; Catalanotti, S; Cattaneo, C; Chen, SZ; Chen, TL; Chen, Y; Creti, P; Cui, SW; Dai, BZ; D’Ali Staiti, G; Danzengluobu; Dattoli, M; De Mitri, I; D’Ettorre Piazzoli, B; Di Girolamo, T; Ding, XH; Di Sciascio, G; Feng, CF; Feng, ZYa; Feng, ZYo; Galeazzi, F; Giroletti, E; Gou, QB; Guo, YQ; He, HH; Hu, HBi; Hu, HBo; Huang, Q; Iacovacci, M; Iuppa, R; James, I; Jia, HY; Labaciren; Li, HJ; Li, JY; Li, XX; Liguori, G; Liu, C; Liu, CQ; Liu, J; Liu, MY; Lu, H; Ma, XH; Mancarella, G; Mari, SM; Marsella, G; Martello, D; Mastroianni, S; Montini, P; Ning, CC; Pagliaro, A; Panareo, M; Panico, B; Perrone, L; Pistilli, P; Qu, XB; Ruggieri, F; Salvini, P; Santonico, R; Shen, PR; Sheng, XD; Shi, F; Stanescu, C; Surdo, A; Tan, YH; Vallania, P; Vernetto, S; Vigorito, C; Wang, B; Wang, H; Wu, CY; Wu, HR; Xu, B; Xue, L; Yan, YX; Yang, QY; Yang, XC; Yao, ZG; Yuan, AF; Zha, M; Zhang, HM; Zhang, JLi; Zhang, JLo; Zhang, L; Zhang, P; Zhang, XY; Zhang, Y; Zhaxiciren; Zhaxisangzhu; Zhou, XX; Zhu, FR; Zhu, QQ; Zizzi, G
- Anno di pubblicazione: 2012
- Tipologia: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/77329
Abstract
The extended gamma-ray source MGRO J1908+06, discovered by the Milagro air shower detector in 2007, has been observed for ∼4 years by the ARGO-YBJ experiment at TeV energies, with a statistical significance of 6.2 standard deviations. The peak of the signal is found at a position consistent with the pulsar PSR J1907+0602. Parameterizing the source shape with a two-dimensional Gauss function, we estimate an extension of σext = 0.49 ± 0.22, which is consistent with a previous measurement by the Cherenkov Array H.E.S.S. The observed energy spectrum is dN/dE = 6.1 ± 1.4 × 10^−13 (E/4 TeV)^−2.54±0.36 photons cm^−2 s^−1 TeV^−1, in the energy range of ∼1–20 TeV. The measured gamma-ray flux is consistent with the results of the Milagro detector, but is 2–3 times larger than the flux previously derived by H.E.S.S. at energies of a few TeV. The continuity of the Milagro and ARGO-YBJ observations and the stable excess rate observed by ARGO-YBJ and recorded in four years of data support the identification of MGRO J1908+06 as the steady powerful TeV pulsar wind nebula of PSR J1907+0602, with an integrated luminosity over 1 TeV ∼ 1.8 times the luminosity of the Crab Nebula.