Plerion as a source of primary cosmic ray electrons

Details Plerion as a source of primary cosmic ray electrons Plerion as a source of primary cosmic ray electrons

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1799s&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

5

Scientific paper

Positrons (e+ ) in cosmic radiation are believed to be produced by the interactions of cosmic ray nuclei with interstellar space (ISM). Their production spectrum can be calculated and the propagation parameters obtained from the observed e+ spectrum. Directly accelerated electrons dominate the e- component. It is found that a simple power law injection spectrum for e- can not explain the observed [e+ /(e+ + e- )] ratio, and one requires a spectral flattening below about 5 GeV. Flat e- spectrum similar to that in Crab supernova with a spectral break by one power around 4.5 GeV could explain both the observed spectrum and the [e+ /(e+ + e- )] , suggesting that the sources of cosmic ray e- are Plerions in the Galaxy. The non-thermal spectrum from the Crab nebula is examined to show that cosmic ray electrons escape into the ISM only after about 2 × 104 yr. from the Plerions.

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