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https://hdl.handle.net/2440/37588
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Type: | Journal article |
Title: | Limits on the TeV flux of diffuse gamma rays as measured with the HEGRA air shower array |
Author: | Aharonian, F. Akhperjanian, A. Barrio, J. Bernlohr, K. Bojahr, H. Bolz, O. Borst, H. Contreras, J. Contina, J. Denninghoff, S. Fonseca, V. Gebauer, H. Gonzalez, J. Gotting, N. Heinzelmann, G. Hermann, G. Heusler, A. Hofmann, W. Horns, D. Ibarra, A. et al. |
Citation: | Astroparticle Physics, 2002; 17(4):459-475 |
Publisher: | Elsevier Science BV |
Issue Date: | 2002 |
ISSN: | 0927-6505 1873-2852 |
Statement of Responsibility: | HEGRA Collaboration, Aharonian, Felix A....G. Rowell...et al. |
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). © 2002 Elsevier Science B.V. All rights reserved. |
Description: | Copyright © 2002 Elsevier Science B.V. All rights reserved. |
DOI: | 10.1016/S0927-6505(01)00175-X |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/523319/description#description |
Published version: | http://dx.doi.org/10.1016/s0927-6505(01)00175-x |
Appears in Collections: | Aurora harvest Physics publications |
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