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http://hdl.handle.net/20.500.12386/30177
Titolo: | KASCADE-Grande Limits on the Isotropic Diffuse Gamma-Ray Flux between 100 TeV and 1 EeV | Autori: | Apel, W. D. Arteaga-Velázquez, J. C. Bekk, K. Bertaina, M. Blümer, J. Bozdog, H. Brancus, I. M. Cantoni, E. Chiavassa, A. Cossavella, F. Daumiller, K. de Souza, V. Di Pierro, F. Doll, P. Engel, R. Feng, Z. Fuhrmann, D. Gherghel-Lascu, A. Gils, H. J. Glasstetter, R. Grupen, C. Haungs, A. Heck, D. Hörandel, J. R. Huege, T. Kampert, K. -H. Kang, D. Klages, H. O. Link, K. Łuczak, P. Mathes, H. J. Mayer, H. J. Milke, J. Mitrica, B. Morello, C. Oehlschläger, J. Ostapchenko, S. Pierog, T. Rebel, H. Roth, M. Schieler, H. Schoo, S. Schröder, F. G. Sima, O. Toma, G. TRINCHERO, GIAN CARLO Ulrich, H. Weindl, A. Wochele, J. Zabierowski, J. KASCADE-Grande Collaboration |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 848 | Fascicolo: | 1 | Da pagina:: | 1 | Abstract: | KASCADE and KASCADE-Grande were multi-detector installations to measure individual air showers of cosmic rays at ultra-high energy. Based on data sets measured by KASCADE and KASCADE-Grande, 90% C.L. upper limits to the flux of gamma-rays in the primary cosmic ray flux are determined in an energy range of {10}<SUP>14</SUP>{--}{10}<SUP>18</SUP> eV. The analysis is performed by selecting air showers with a low muon content as expected for gamma-ray-induced showers compared to air showers induced by energetic nuclei. The best upper limit of the fraction of gamma-rays to the total cosmic ray flux is obtained at 3.7× {10}<SUP>15</SUP> eV with 1.1× {10}<SUP>-5</SUP>. Translated to an absolute gamma-ray flux this sets constraints on some fundamental astrophysical models, such as the distance of sources for at least one of the IceCube neutrino excess models. | URI: | http://hdl.handle.net/20.500.12386/30177 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aa8bb7 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aa8bb7 | Bibcode ADS: | 2017ApJ...848....1A | Fulltext: | open |
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