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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31607
Title: Signature of Energy Losses on the Cosmic Ray Electron Spectrum
Authors: Evoli, Carmelo
Blasi, Pasquale
AMATO, Elena 
Aloisio, Roberto
Issue Date: 2020
Journal: PHYSICAL REVIEW LETTERS 
Number: 125
Issue: 5
Abstract: We show that the fine structure of the electron spectrum in cosmic rays, especially the excess claimed by AMS-02 at energies $\sim$42 GeV, is fully accounted for in terms of inverse Compton losses in the photon background dominated by ultraviolet, infrared and CMB photons, plus the standard synchrotron losses in the Galactic magnetic field. The transition to the Klein-Nishina regime on the ultraviolet background causes the feature. Hence, contrary to previous statements, observations do not require the overlap of different components. We stress that the feature observed by AMS-02 at energies $\sim$42 GeV is not related to the positron excess, which instead requires the existence of positron sources, such as pulsars. Because energy losses are the physical explanation of this feature, we indirectly confirm that the transport of leptons in the Galaxy is loss-dominated down to energies of the order of tens of GeV. This finding imposes strong constraints on the feasibility of alternative theories of cosmic transport in which the grammage is accumulated in cocoons concentrated around sources, requiring that electrons and positrons become loss dominated only at very high energies.
URI: http://hdl.handle.net/20.500.12386/31607
URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.051101
http://arxiv.org/abs/2007.01302v2
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.125.051101
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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