Multiple UHECR Events from Galactic hadron jets

Details Multiple UHECR Events from Galactic hadron jets Multiple UHECR Events from Galactic hadron jets

2003-01-30

arxiv.org/abs/astro-ph/0301595v1

Astropart.Phys. 19 (2003) 605-616

Astronomy and Astrophysics

Astrophysics

14 pages + 1 appendix, 3 figures, accepted for publication in Astroparticle Physics

Scientific paper

10.1016/S0927-6505(03)00104-X

We propose a new observational test of top-down source models for the ultra-high-energy cosmic-rays (UHECRs), based on the simultaneous observation of two or more photons from the same Galactic hadron jet. We derive a general formula allowing one to calculate the probability of detecting such `multiple events', for any particular top-down model, once the physical parameters of the associated hadron jets are known. We then apply our results to a generic top-down model involving the decay of a supermassive particle, and show that under reasonable assumptions the next-generation UHECR detectors would be able to detect multiple events on a timescale of a few years, depending on the mass of the top-down progenitor. Either the observation or the non-observation of such events will provide constraints on the UHECR top-down models and/or the physics of hadronization at ultra-high energy.

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