On energy spectra of UHE cosmic rays accelerated in supergalactic accretion flows

Details On energy spectra of UHE cosmic rays accelerated in supergalactic accretion flows On energy spectra of UHE cosmic rays accelerated in supergalactic accretion flows

2000-02-03

arxiv.org/abs/astro-ph/0002075v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, submitted to Astron. Astrophys

Scientific paper

Some ultra-high energy (UHE) cosmic ray (CR) events may be correlated with the Local Supercluster plane. We consider acceleration of such particles at the large-scale accretion flows of matter towards such plane and/or accretion flows onto galaxy clusters. The formed shocks and the general compression flow are expected to allow for CR diffusive acceleration of UHE particles. For a simplified flow geometry we consider a stationary acceleration of such CRs and we discuss influence of model parameters on a particle spectral index. We show that the general convergent flow pattern leads naturally to very flat proton spectra with the phase-space spectral indices $\sigma \approx 3.0$, as compared to the `canonical' shock value of 4.0.

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