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

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Abstract

We report the observation of a very high energy gamma-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 σ = (0.40+0.32−0.22)°, 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 gamma-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.

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  • 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 , C. Cattaneo , S.Z. Chen , T.L. Chen , Y. Chen , P. Creti , S.W. Cui , B.Z. Dai , G. D'Alí Staiti , A. D'Amone , Danzengluobu , 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 , S.N. Sbano , P.R. Shen , X.D. Sheng , F. Shi , 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

Titolo volume/Rivista

THE ASTROPHYSICAL JOURNAL

Anno di pubblicazione

2013

ISSN

0004-637X

ISBN

Non Disponibile

Numero di citazioni Wos

18

Ultimo Aggiornamento Citazioni

28/04/2018

Numero di citazioni Scopus

17

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile