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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



ID: 28253.0, MPI für Kernphysik / High-Energy Astrophysics
Limits on the TeV flux of diffuse gamma rays as measured with the HEGRA air shower array
Authors:Aharonian, F. A.; Akhperjanian, A. G.; Barrio, J. A.; Bernlöhr, K.; Bojahr, H.; Bolz, O.; Borst, H.; Contreras, J. L.; Cortina, J.; Denninghoff, S.; Fonseca, V.; Gebauer, H. J.; Gonzalez, J. C.; Gotting, N.; Heinzelmann, G.; Hermann, G.; Heusler, A.; Hofmann, W.; Horns, D.; Ibarra, S.; Iserlohe, C.; Jung, I.; Kankanyan, R.; Kestel, M.; Kettler, J.; Kohnle, A.; Konopelko, A.; Kornmayer, H.; Kranich, D.; Krawczynski, H.; Lampeitl, H.; Lopez, M.; Lorenz, E.; Lucarelli, F.; Magnussen, N.; Mang, O.; Meyer, H.; Mirzoyan, R.; Moralejo, A.; Ona, E.; Padilla, L.; Panter, M.; Plaga, R.; Plyasheshnikov, A.; Prahl, J.; Pühlhofer, G.; Rauterberg, G.; Rhode, W.; Rohring, A.; Rowell, G. P.; Sahakian, V.; Samorski, M.; Schilling, M.; Schroder, F.; Siems, M.; Stamm, W.; Tluczykont, M.; Völk, H. J.; Wiedner, C.; Wittek, W.
Language:English
Date of Publication (YYYY-MM-DD):2002-07
Title of Journal:Astroparticle Physics
Journal Abbrev.:Astropart Phys.
Volume:17
Issue / Number:4
Start Page:459
End Page:475
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Using data from the HEGRA air shower array. taken in the period from April 1998 to March 2000, upper limits on the ratio I- gamma/I-CR of the diffuse photon flux I-gamma to the hadronic cosmic ray flux I-CR are determined for the energy region 20, 100 TeV. The analysis uses a gamma-hadron discrimination which is based on differences in the development of photon- and hadron-induced air showers after the shower maximum, A method which is sensitive only to the non-isotropic component of the diffuse photon flux yields an upper limit of I-gamma/I-CR (at 54 TeV) < 2.0 x 10 (3) (at the 90% confidence level) for a sky region near the inner galaxy (20degrees < galactic longitude < 60degrees and \galactic latitude\ < 5degrees). A method which is sensitive to both the isotropic and the non-isotropic component yields global upper limits of I-gamma/I-CR (at 31 TeV) < 1.2 x 10(-2) and I-gamma/(CR) (at 53 TeV) < 1.4 x 10 (2) (at the 90% confidence level). (C) 2002 Elsevier Science B.V. All rights reserved.
Free Keywords:cosmic rays; diffuse gamma-ray galactic emission; gamma rays; observations
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Yerevan Phys Inst, Yerevan 375036, Armenia; Univ Complutense Madrid, Fac Ciencias Fis, E-28040 Madrid, Spain; Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany; Univ Kiel, Inst Exptl & Angew Phys, D-24118 Kiel, Germany; Univ Hamburg, Inst Expt Phys 2, D-22761 Hamburg, Germany
Identifiers:ISI:000176198700008 [ID No:1]
ISSN:0927-6505 [ID No:2]
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