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

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'Al\'i 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

arXiv:1201.1973·astro-ph.HE·January 11, 2012

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

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'Al\'i Staiti, Danzengluobu

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TL;DR

This paper reports the detection of TeV gamma rays from the Cygnus region using ARGO-YBJ data, confirming the MGRO J2031+41 source but not MGRO J2019+37, suggesting variability or different source characteristics.

Contribution

First observation of TeV gamma rays from the Cygnus region with ARGO-YBJ, confirming MGRO J2031+41 and providing flux upper limits for MGRO J2019+37.

Findings

01

Significant gamma-ray signal from MGRO J2031+41 at 6.4 sigma

02

No detection of MGRO J2019+37 by ARGO-YBJ, flux below Milagro's measurement

03

Flux upper limits suggest possible source variability or different emission mechanisms

Abstract

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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