Constraining superheavy dark matter model of UHECR with SUGAR data

Details Constraining superheavy dark matter model of UHECR with SUGAR data Constraining superheavy dark matter model of UHECR with SUGAR data

2003-06-20

arxiv.org/abs/astro-ph/0306413v1

Astropart.Phys.21:535-542,2004

Astronomy and Astrophysics

Astrophysics

10 pages, 12 figures

Scientific paper

10.1016/j.astropartphys.2004.03.

Models which associate the origin of the ultra-high energy cosmic rays (UHECR) with decays of relic superheavy particles predict the anisotropy of UHECR flux toward the Galactic center. We use the existing SUGAR data, which covered the Galactic center best so far, to look for such a signal and limit the fraction of UHECR produced by this mechanism. The absence of anisotropy toward the Galactic center in the SUGAR data implies at 95% confidence level that the fraction of SHDM-related cosmic rays should be less than 20% at $E>1\times10^{19}$ eV and less than 50% at $E>4\times10^{19}$ eV.

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