2007

Composition of UHECR and the Pierre Auger Observatory Spectrum

Arisaka, Katsushi, Gelmini, Graciela B., Healy, Matthew et al.

Understand

We fit the recently published Pierre Auger ultra-high energy cosmic ray spectrum assuming that either nucleons or nuclei are emitted at the sources.

We consider the simplified cases of pure proton, or pure oxygen, or pure iron injection.
We perform an exhaustive scan in the source evolution factor, the spectral index, the maximum energy of the source spectrum Z E_{max}, and the minimum distance to the sources.
We show that the Pierre Auger spectrum agrees with any of the source compositions we assumed.

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