Phys. Rev. Lett. 85, 1154–1157 (2000)Statistics of Clustering of Ultrahigh Energy Cosmic Rays and the Number of Their SourcesReceived 20 January 2000; published in the issue dated 7 August 2000 Observation of clustering of ultrahigh energy cosmic rays (UHECR) suggests that they are emitted by compact sources. Assuming small ( <3°) 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>1020eV gives h*∼6×10-3Mpc-3. With increasing statistics, this estimate may lead to exclusion of some models. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.1154
DOI:
10.1103/PhysRevLett.85.1154
PACS:
98.70.Sa
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