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arxiv: 1409.4809 · v3 · pith:5UTKV2V7new · submitted 2014-09-16 · 🌌 astro-ph.HE · astro-ph.IM

Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above 10¹7.8 eV

Pierre Auger Collaboration This is my paper
classification 🌌 astro-ph.HE astro-ph.IM
keywords air-showeraboveaugerdepthenergiesenergymaximummean
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We report a study of the distributions of the depth of maximum, Xmax, of extensive air-shower profiles with energies above 10^17.8 eV as observed with the fluorescence telescopes of the Pierre Auger Observatory. The analysis method for selecting a data sample with minimal sampling bias is described in detail as well as the experimental cross-checks and systematic uncertainties. Furthermore, we discuss the detector acceptance and the resolution of the Xmax measurement and provide parameterizations thereof as a function of energy. The energy dependence of the mean and standard deviation of the Xmax-distributions are compared to air-shower simulations for different nuclear primaries and interpreted in terms of the mean and variance of the logarithmic mass distribution at the top of the atmosphere.

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