Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294l..41a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 3, p. L41-L44
Astronomy and Astrophysics
Astrophysics
111
Cosmic Rays, Gamma Rays, High Energy Electrons, Interstellar Matter, Positrons, Pulsars, Electron Sources, Electron-Positron Pairs, Energy Spectra
Scientific paper
The sharp increase of the positron content in the cosmic ray electron flux at E greater than or equal to 10 GeV is regarded as an enigma. Here, we show that in fact the `enigma' disappears if the propagation of the cosmic ray electrons is treated correctly. The proper treatment of cosmic rays, namely, separation of the contribution of one (or few) nearby (r approximately 100 pc) and relatively young (t approximately 105 yr) source(s) from the contribution from distant (r greater than or equal to 1 kpc) sources explains the features of both energy spectrum and charge composition of electrons observed between approximately 100 MeV and 2 TeV. We argue that the nearby gamma-ray pulsar Geminga is a probable source responsible for the observed very high energy electrons.
Aharonian Felix A.
Atoyan Armen M.
Voelk Heinrich J.
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