Galactic Constraints on the Sources of Ultra-High Energy Cosmic Rays
Astrophysics
2007-05-23 v1 High Energy Physics - Phenomenology
Abstract
We show that if the sources of ultra-high energy cosmic rays (UHECRs) with energies E>10^{19}eV are associated with galaxies, then the production of UHECRs must occur in transient events. Our galaxy is currently at a dim state in between transients. The time interval between transients is >3x10^4 years if the minimum Lorentz factor to which protons are accelerated in the transients is between 10^3 and 10^7. This constraint is satisfied by gamma-ray bursts.
Keywords
Cite
@article{arxiv.astro-ph/0205272,
title = {Galactic Constraints on the Sources of Ultra-High Energy Cosmic Rays},
author = {Abraham Loeb and Eli Waxman},
journal= {arXiv preprint arXiv:astro-ph/0205272},
year = {2007}
}
Comments
submitted to Phys. Rev. D