Cosmological Origin for Cosmic Rays Above $10^{19}$ eV

Abstract

The cosmic ray spectrum at $10^{19}\mathrm{eV}-10^{20}\mathrm{eV}$, reported by the Fly's Eye and the AGASA experiments, is shown to be consistent with a cosmological distribution of sources of protons, with a power law generation spectrum $\mathrm{d}\ln N/\mathrm{d}\ln E=-2.3\pm 0.5$ and energy production rate of $4.5\pm 1.5\times 10^{44}\mathrm{erg}{\mathrm{Mpc}}^{-3}{\mathrm{yr}}^{-1}$. The two events measured above $10^{20}\mathrm{eV}$ are not inconsistent with this model. Verifying the existence of a ``black-body cutoff'', currently observed with low significance, would require $\sim 30$ observation-years with existing experiments, but only $\sim 1$ year with the proposed $\sim 5000{\mathrm{km}}^2$ detectors. For a cosmological source distribution, no anisotropy is expected in the angular distribution of events with energies up to $\sim 5\times 10^{19}\mathrm{eV}$.

uuencoded gz-compressed postscript file, including 2 figures; To appear in the October 10 (1995) issue of the Ap. J. Letters

References in corpus (1)

• COSMOLOGICAL GAMMA RAY BURSTS AND THE HIGHEST ENERGY COSMIC RAYS

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