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2013ApJ...767...99B - Astrophys. J., 767, 99 (2013/April-3)

Observation of TeV gamma rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment.

BARTOLI B., BERNARDINI P., BI X.J., BOLOGNINO I., BRANCHINI P., BUDANO A., CALABRESE MELCARNE A.K., CAMARRI P., CAO Z., CARDARELLI R., CATALANOTTI S., CATTANEO C., CHEN S.Z., CHEN T.L., CHEN Y., CRETI P., CUI S.W., DAI B.Z., D'ALI STAITI G., D'AMONE A., DANZENGLUOBU, DE MITRI I., D'ETTORRE PIAZZOLI B., DI GIROLAMO T., DING X.H., DI SCIASCIO G., FENG C.F., FENG Z., FENG Z., GALEAZZI F., GIROLETTI E., GOU Q.B., GUO Y.Q., HE H.H., HU H., HU H., HUANG Q., IACOVACCI M., IUPPA R., JAMES I., JIA H.Y., LABACIREN, LI H.J., LI J.Y., LI X.X., LIGUORI G., LIU C., LIU C.Q., LIU J., LIU M.Y., LU H., MA L.L., MA X.H., MANCARELLA G., MARI S.M., MARSELLA G., MARTELLO D., MASTROIANNI S., MONTINI P., NING C.C., PAGLIARO A., PANAREO M., PANICO B., PERRONE L., PISTILLI P., RUGGIERI F., SALVINI P., SANTONICO R., SBANO S.N., SHEN P.R., SHENG X.D., SHI F., SURDO A., TAN Y.H., VALLANIA P., VERNETTO S., VIGORITO C., WANG B., WANG H., WU C.Y., WU H.R., XU B., XUE L., YANG Q.Y., YANG X.C., YAO Z.G., YUAN A.F., ZHA M., ZHANG H.M., ZHANG J., ZHANG J., ZHANG L., ZHANG P., ZHANG X.Y., ZHANG Y., ZHAO J., ZHAXICIREN, ZHAXISANGZHU, ZHOU X.X., ZHU F.R., ZHU Q.Q., ZIZZI G. (The ARGO-YBJ Collaboration)

Abstract (from CDS):

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 σ = (0.40–0.22+0.32)°, which is consistent with the HESS measurement. The observed energy spectrum is dN/dE = (9.0±1.6)x10–13(E/5 TeV)–2.32±0.23 photons/cm2/s/TeV, 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.

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Journal keyword(s): gamma rays: general

Simbad objects: 21

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