Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

preprint2012arXivOpen access

B. Bartoli P. Bernardini X. J. Bi C. Bleve I. Bolognino P. Branchini A. Budano A. K. Calabrese Melcarne P. Camarri Z. Cao R. Cardarelli S. Catalanotti C. Cattaneo S. Z. Chen T. L. Chen Y. Chen P. Creti S. W. Cui B. Z. Dai G. D'Alí Staiti Danzengluobu M. Dattoli I. De Mitri B. D'Ettorre Piazzoli T. Di Girolamo X. H. Ding G. Di Sciascio C. F. Feng Zhaoyang Feng Zhenyong Feng F. Galeazzi E. Giroletti Q. B. Gou Y. Q. Guo H. H. He Haibing Hu Hongbo Hu Q. Huang M. Iacovacci R. Iuppa I. James H. Y. Jia 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. Ma X. H. Ma G. Mancarella S. M. Mari G. Marsella D. Martello S. Mastroianni P. Montini C. C. Ning A. Pagliaro M. Panareo B. Panico L. Perrone P. Pistilli F. Ruggieri P. Salvini R. Santonico P. R. Shen X. D. Sheng F. Shi C. Stanescu A. Surdo Y. H. Tan P. Vallania S. Vernetto C. Vigorito B. Wang H. Wang C. Y. Wu H. R. Wu B. Xu L. Xue Q. Y. Yang X. C. Yang Z. G. Yao A. F. Yuan M. Zha H. M. Zhang Jilong Zhang Jianli Zhang L. Zhang P. Zhang X. Y. Zhang Y. Zhang J. Zhao Zhaxiciren Zhaxisangzhu X. X. Zhou F. R. Zhu Q. Q. Zhu G. Zizzi

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We report the observation of TeV gamma-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 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) gamma-ray signal is found from MGRO J2031+41, with a flux consistent with the measurement by Milagro.

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Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

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