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26 April 2024

» arxiv » 1710.2889

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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-Velázquez ; K. Bekk ; M. Bertaina ; J. Blümer ; H. Bozdog ; I. M. Brancus ; E. Cantoni ; 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. Hörandel ; T. Huege ; K.-H. Kampert ; D. Kang ; H. O. Klages ; K. Link ; P. Łuczak ; H. J. Mathes ; H. J. Mayer ; J. Milke ; B. Mitrica ; C. Morello ; J. Oehlschläger ; S. Ostapchenko ; T. Pierog ; H. Rebel ; M. Roth ; H. Schieler ; S. Schoo ; F. G. Schröder ; O. Sima ; G. Toma ; G. C. Trinchero ; H. Ulrich ; A. Weindl ; J. Wochele ; J. Zabierowski ;
Date:	8 Oct 2017
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 ${10}^{14} - {10}^{18}$ 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 $3.7 imes {10}^{15}$ eV with $1.1 imes {10}^{-5}$. 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.
Source:	arXiv, 1710.2889
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