## On energy spectra of UHE cosmic rays accelerated in supergalactic accretion flows
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 the 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 , as compared to the `canonical' shock value of 4.0.
This article contains no SIMBAD objects. ## Contents- 1. Introduction
- 2. Physical conditions in supergalactic accretion flows
- 3. A model of stationary acceleration
- 4. Discussion
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000 Online publication: March 17, 2000 |