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  • Title: Statistics of clustering of ultrahigh energy cosmic rays and the number of their sources.
    Author: Dubovsky SL, Tinyakov PG, Tkachev II.
    Journal: Phys Rev Lett; 2000 Aug 07; 85(6):1154-7. PubMed ID: 10991500.
    Abstract:
    Observation of clustering of ultrahigh energy cosmic rays (UHECR) suggests that they are emitted by compact sources. Assuming small ( <3 degrees ) deflection of UHECR during the propagation, the statistical analysis of clustering allows an estimate of the spatial density of the sources h(*), including those not yet observed. When applied to astrophysical models involving extragalactic sources, the estimate based on 14 events with energy E>10(20) eV gives h(*) approximately 6x10(-3) Mpc(-3). With increasing statistics, this estimate may lead to exclusion of some models.
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