Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra High Energy Cosmic Rays: Anisotropies and Spectrum   The recent results of the Pierre Auger Observatory on the possible
correlation of Ultra High Energy Cosmic Rays events and several nearby discrete
sources could be the starting point of a new era with charged particles
astronomy. In this paper we introduce a simple model to determine the effects
of any local distribution of sources on the expected flux. We consider two
populations of sources: faraway sources uniformly distributed and local point
sources. We study the effects on the expected flux of the local distribution of
sources, referring also to the set of astrophysical objects whose correlation
with the Auger events is experimentally claimed.

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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: stat
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg