Ultra–High‐Energy Cosmic Rays May Come from Clustered Sources | Zendy

John N. Bahcall | Zendy; Eli Waxman | Zendy

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Ultra–High‐Energy Cosmic Rays May Come from Clustered Sources

Author(s) -

John N. Bahcall,

Eli Waxman

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/317028

Subject(s) - physics , cosmic microwave background , astrophysics , cosmic ray , galaxy , ultra high energy cosmic ray , cutoff , flux (metallurgy) , correlation function (quantum field theory) , cosmic cancer database , sigma , anisotropy , astronomy , optics , materials science , optoelectronics , quantum mechanics , dielectric , metallurgy

Clustering of cosmic-ray sources affects the flux observed beyond the cutoffimposed by the cosmic microwave background and may be important in interpretingthe AGASA, Fly's Eye, and HiRes data. The standard deviation, sigma, in thepredicted number, N, of events above 10^{20} eV is sigma/N = 0.9(r_0/10Mpc)^{0.9}, where r_0 is the unknown scale length of the correlation function(r_0 = 10 Mpc for field galaxies). Future experiments will allow thedetermination of r_0 through the detection of anisotropies in arrivaldirections of ~ 10^{20} eV cosmic-rays over angular scales of Theta ~ r_0/30Mpc.Comment: Accepted for publication in Astrophysical Journa

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