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KASCADE-Grande Limits on the Isotropic Diffuse Gamma-Ray Flux between 100 TeV and 1 EeV

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arxiv 1710.02889 v1 pith:BMTVCXVN submitted 2017-10-08 astro-ph.HE

KASCADE-Grande Limits on the Isotropic Diffuse Gamma-Ray Flux between 100 TeV and 1 EeV

KASCADE-Grande Collaboration: W. D. Apel , J. C. Arteaga-Vel\'azquez , K. Bekk , M. Bertaina , J. Bl\"umer , H. Bozdog , I. M. Brancus , E. Cantoni
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A. Chiavassa F. Cossavella K. Daumiller V. de Souza F. Di Pierro P. Doll R. Engel Z. Feng D. Fuhrmann A. Gherghel-Lascu H. J. Gils R. Glasstetter C. Grupen A. Haungs D. Heck J. R. H\"orandel T. Huege K.-H. Kampert D. Kang H. O. Klages K. Link P. {\L}uczak H. J. Mathes H. J. Mayer J. Milke B. Mitrica C. Morello J. Oehlschl\"ager S. Ostapchenko T. Pierog H. Rebel M. Roth H. Schieler S. Schoo F. G. Schr\"oder O. Sima G. Toma G. C. Trinchero H. Ulrich A. Weindl J. Wochele J. Zabierowski
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classification astro-ph.HE
keywords fluxshowerscosmickascade-grandeenergygamma-raygamma-rayskascade
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 ${10}^{14} - {10}^{18}$ 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 $3.7 \times {10}^{15}$ eV with $1.1 \times {10}^{-5}$. 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.

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