$An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory$

An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory

An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by obse...

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Veröffentlicht in:	Astroparticle physics 2007-03, Vol.27 (2), p.155-168
Hauptverfasser:	Allison, P., Alvarez, C., Ambrosio, M., Arisaka, K., Arneodo, F., Asch, T., Barkhausen, M., Beatty, J., Beau, T., Bellido, J.A., Blanco, F., Blasi, P., Bleve, C., Boháčová, M., Brunet, J.M., Caballero-Mora, K.S., Cai, B., Camin, D.V., Capdevielle, J.N., Caruso, R., Cordier, A., Dang Quang, T., Darriulat, P., Dawson, B.R., de Carvalho, L.A., de Mello, W.J.M., Deligny, O., Dova, M.T., Engel, R., Erdmann, M., Etchegoyen, A., Ewers, A., Fazio, D., Fazzini, N., Filevich, A., Fokitis, E., Geenen, H., Geranios, A., Giller, M., Gobbi, F., Gomez Albarracin, F., Gonçalves do Amaral, M., Gonzalez, D., Guarino, F., Harari, D., Harton, J.L., Healy, M.D., Heck, D., Kalashev, O., Kleifges, M., Kleinfeller, J., Lachaud, C., Lago, B.L., Maldera, S., Mandat, D., Martinez, N., Martínez, J., Maurizio, D., Menshikov, A., Meyhandan, R., Mostafá, M., Muller, M.A., Nierstenhöfer, N., Nosek, D., Olinto, A., Otero, L., Palatka, M., Paul, T., Pepe, I.M., Pham Thi, T.N., Pierog, T., Prado, L., Rautenberg, J., Reucroft, S., Risi, A., Risse, M., Rizi, V., Robbins, S., Roberts, M., Ros, G., Rovero, A.C., Salamida, F., Salazar, H., Sigl, G., Swain, J., Tamashiro, A., Tonachini, A., Travnicek, P., Tunnicliffe, V., Urban, M., Valdés Galicia, J.F., Valiño, I., van den Berg, A.M., Videla, M., Voyvodic, L., Wieczorek, G., Wilczyński, H., Xu, J., Zavrtanik, M., Zepeda, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astrophysics Cosmic rays Cosmology and Extra-Galactic Astrophysics Extensive air showers High Energy Physics - Phenomenology Physics Pierre Auger Observatory Sciences of the Universe Ultra-high energy photons
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Beschreibung
Zusammenfassung:	An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10 19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored.
ISSN:	0927-6505 1873-2852
DOI:	10.1016/j.astropartphys.2006.10.004