2013/03/06 by YBJ Collaboration, B. Bartoli, P. Bernardini +119
Physics and Astronomy · #Argo #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Gamma ray #Nuclear physics #Optics #Photon #Photon flux #Physics #Pulsars and Gravitational Waves Research #Range (aeronautics) #astro-ph.HE
paper · pdf · doi:10.1088/0004-637x/767/2/99
published as The Astrophysical Journal, 767:99 (2013) · 17 pages, 4 figures, have been accepted for publication in ApJ
arxiv created 2013/03/06 · openalex publication_date 2013/04/01 · arxiv updated 2013/04/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the observation of a very high energy γ-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 , 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 γ-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.