Cosmic-ray electron injection from the ionization of nuclei

Details Cosmic-ray electron injection from the ionization of nuclei Cosmic-ray electron injection from the ionization of nuclei

2009-08-21

arxiv.org/abs/0908.3217v1

Phys.Rev.Lett.103:121102,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 1 figure, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.121102

We show that the secondary electrons ejected from the ionization of heavy ions can be injected into the acceleration process that occurs at supernova remnant shocks. This electron injection mechanism works since ions are ionized during the acceleration when they move already with relativistic speed, just like ejected electrons do. Using the abundances of heavy nuclei measured in cosmic rays at Earth, we estimate the electron/proton ratio at the source to be ~10^-4, big enough to account for the nonthermal synchrotron emission observed in young SNRs. We also show that the ionization process can limit the maximum energy that heavy ions can reach.

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