OBSERVATION OF TeV GAMMA RAYS FROM THE CYGNUS REGION WITH THE ARGO-YBJ EXPERIMENT
- 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, LL; 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; 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; Yang, QY; Yang, XC; Yao, ZG; Yuan, AF; M. Zha, M; Zhang, HM; Zhang, JLi; Zhang, JLo; Zhang, L; Zhang, P; Zhang, XY; Zhang, Y; Zhao, J; Zhaxiciren; Zhaxisangzhu; Zhou, XX; Zhu, FR; Zhu, QQ; Zizzi, G
- Anno di pubblicazione: 2012
- Tipologia: Articolo in rivista (Articolo in rivista)
- Parole Chiave: gamma rays; general – pulsars; individual (MGRO J2019+37, MGRO J2031+41)
- OA Link: http://hdl.handle.net/10447/63701
Abstract
We report the observation of TeV γ -rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this region including the two bright extended MGRO J2019+37 and MGRO J2031+41. According to the Milagro data set, at 20 TeV MGRO J2019+37 is the most significant source apart from the Crab Nebula. No signal from MGRO J2019+37 is detected by the ARGO-YBJ experiment, and the derived flux upper limits at the 90% confidence level for all the events above 600 GeV with medium energy of 3 TeV are lower than the Milagro flux, implying that the source might be variable and hard to be identified as a pulsar wind nebula. The only statistically significant (6.4 standard deviations) γ -ray signal is found from MGRO J2031+41, with a flux consistent with the measurement by Milagro.