Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-12-21
Astrophys.J. 484 (1997) 323-328
Astronomy and Astrophysics
Astrophysics
12 pages, LaTex (aaspp4.sty), 1 figure, appears here as published in The Astrophysical Journal; compared to previous version,
Scientific paper
10.1086/304304
The energetics, spectrum, and composition of cosmic rays with energies below about $10^{15}$ eV are fairly well explained by models involving supernova shocks. In contrast, no widely accepted theory exists for the origin of ultra-high energy cosmic rays (UHECRs), which have energies above $10^{15}$ eV. Instead of proposing a specific model, here we place strong constraints on any model of UHECRs involving isolated neutron stars (no companions). We consider the total power requirements and show that the only viable power source associated with isolated neutron stars is rotation. Mechanisms based on accretion from the interstellar medium fall short of the necessary power despite the most optimistic assumptions. Power considerations also demonstrate that not enough rotational energy is tapped by a "propeller"-like acceleration of interstellar matter. The most promising source of energy is rotational spindown via magnetic braking. We examine microphysical energy loss processes near magnetized neutron stars and conclude that the most likely site for yielding UHECRs from isolated neutron stars is near or beyond the light cylinder.
Miller Michael Coleman
Olinto Angela V.
Venkatesan Aparna
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