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arXiv:0706.4322 (astro-ph)
[Submitted on 28 Jun 2007]

Title:Measurement of the UHECR spectrum above 10 EeV at the Pierre Auger Observatory using showers with zenith angles greater than 60 degrees

Authors:P. Facal San Luis (for the Pierre Auger Collaboration)
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Abstract: We report a measurement of the cosmic ray energy spectrum obtained using the inclined events detected with the Pierre Auger Observatory. Showers with zenith angles between 60 and 80 degrees recorded in the period between 1 January 2004 and 28 February 2007 are analysed. Showers are first reconstructed in arrival direction and then fitted to density maps of the muon numbers obtained from 10 EeV simulated proton showers for different arrival directions, in order to obtain the core position and an overall normalisation factor N19 which is used as an energy estimator. The parameter N19 is shown to be correlated with the shower energy measured with the fluorescence technique for a sub-sample of good quality hybrid showers. This correlation, measured with hybrid events, is then used to determine the energy of all the showers.
Comments: To be published in Proceedings of the 30th International Cosmic Ray Conference (ICRC 2007), Merida, Yucatan, Mexico, 3-11 Jul 2007. 4 pages
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.4322 [astro-ph]
  (or arXiv:0706.4322v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.4322

Submission history

From: Pedro Facal San Luis [view email]
[v1] Thu, 28 Jun 2007 23:48:34 UTC (74 KB)
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