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Astronomy and Astrophysics 452 (2006) L19-L22
On the viability of holistic cosmic-ray source models
J. Aublin1, E. Parizot1

We consider the energy spectrum of cosmic-rays (CRs) from a purely phenomenological point of view and investigate the possibility that they all be produced by the same type of sources with a single power-law spectrum, in E^{-x}, from thermal to ultra-high energies. We show that the relative fluxes of the Galactic (GCR) and extra-galactic (EGCR) components are compatible with such a holistic model, provided that the index of the source spectrum be x \simeq 2.23\pm 0.07. This is compatible with the best-fit indices for both GCRs and EGCRs, assuming that their source composition is the same, which is indeed the case in a holistic model. It is also compatible with theoretical expectations for particle acceleration at relativistic shocks.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
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