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Limits on the TeV flux of diffuse gamma rays as measured with the HEGRA air shower array |
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| Institution: | a Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany b Yerevan Physics Institute, Alikhanian Br. 2, 375036 Yerevan, Armenia c Facultad de Ciencias Físicas, Universidad Complutense, Ciudad Universitaria, E-28040 Madrid, Spain d Fachbereich Physik, Universität Wuppertal, Gaußstrasse 20, D-42097 Wuppertal, Germany e Institut für Experimentelle und Angewandte Physik, Universität Kiel, Leibnizstraße 15-19, D-24118 Kiel, Germany f Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany g II. Institut für Experimentalphysik, Universität Hamburg,Luruper Chaussee 149, D-22761 Hamburg, Germany |
| Abstract: | Using data from the HEGRA air shower array, taken in the period from April 1998 to March 2000, upper limits on the ratio Iγ/ICR of the diffuse photon flux Iγ to the hadronic cosmic ray flux ICR 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 Iγ/ICR (at 54 TeV) <2.0×10?3 (at the 90% confidence level) for a sky region near the inner galaxy (20°< galactic longitude <60° and |galactic latitude |<5°). A method which is sensitive to both the isotropic and the non-isotropic component yields global upper limits of Iγ/ICR (at 31 TeV) <1.2×10?2 and Iγ/ICR (at 53 TeV) <1.4×10?2 (at the 90% confidence level). |
| Keywords: | Cosmic rays Diffuse gamma-ray galactic emission Gamma rays: observations |
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