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On the viability of holistic cosmic-ray source models

Abstract : 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.
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Contributor : Suzanne Robert <>
Submitted on : Monday, February 19, 2007 - 12:12:03 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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J. Aublin, E. Parizot. On the viability of holistic cosmic-ray source models. Astronomy and Astrophysics - A&A, EDP Sciences, 2006, 452, pp.L19-L22. ⟨10.1051/0004-6361:20065293⟩. ⟨in2p3-00131760⟩

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