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

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Zeitschriftentitel:	The Astrophysical Journal
Personen und Körperschaften:	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., Souza, V. de, Pierro, F. Di, 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, G. C., Ulrich, H., Weindl, A., Wochele, J., Zabierowski, J.
In:	The Astrophysical Journal, 848, 2017, 1, S. 1
Format:	E-Article
Sprache:	Unbestimmt
veröffentlicht:	American Astronomical Society
Schlagwörter:	Space and Planetary Science Astronomy and Astrophysics

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Zusammenfassung:	<jats:title>Abstract</jats:title> <jats:p>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<jats:italic>-</jats:italic>rays in the primary cosmic ray flux are determined in an energy range of <jats:inline-formula> <jats:tex-math> <?CDATA ${10}^{14}\mbox{--}{10}^{18}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaa8bb7ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> 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 <jats:inline-formula> <jats:tex-math> <?CDATA $3.7\times {10}^{15}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaa8bb7ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> eV with <jats:inline-formula> <jats:tex-math> <?CDATA $1.1\times {10}^{-5}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaa8bb7ieqn3.gif" xlink:type="simple" /> </jats:inline-formula>. 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.</jats:p>
Umfang:	1
ISSN:	0004-637X 1538-4357
DOI:	10.3847/1538-4357/aa8bb7