Heavy nuclei at the end of the cosmic ray spectrum?

Details Heavy nuclei at the end of the cosmic ray spectrum? Heavy nuclei at the end of the cosmic ray spectrum?

1999-03-10

arxiv.org/abs/astro-ph/9903145v3

Phys.Rev.D60:103001,1999

Astronomy and Astrophysics

Astrophysics

Revised version, to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.60.103001

We provide an account of the possible acceleration of iron nuclei up to energies $\sim300$ EeV in the nearby, metally-rich starburst galaxy NGC 253. It is suggested that particles can escape from the nuclear region with energies of $\sim10^{15}$ eV and then could be reaccelerated at the terminal shock of the galactic superwind generated by the starburst, avoiding in this way the photodisintegration expected if the nuclei were accelerated in the central region of high photon density. We have also made estimates of the expected arrival spectrum, which displays a strong dependency with the energy cutoff at the source.

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