Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011nimpa.630...52k&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 630, Issue 1, p. 52-54.
Physics
Scientific paper
We investigate the observed spectrum of cosmic-ray electrons and positrons from astrophysical sources, especially pulsars, and the physical processes for making the spectrum spiky or smooth via continuous and multiple cosmic-ray injections. We find that (1) the average spectrum with the local birth rate of pulsars (including the off-axis ones) is relatively smooth, consistent with the PAMELA data, but requires an energetic source for the ATIC/PPB-BETS peak. Such a source should not occur repeatedly at the same rate. (2) A continuous injection produces a broad peak and a high energy tail above the peak, which can constrain the source duration (≲ 105 years with the current data). We also discuss the H.E.S.S. data in the TeV range which constrain the total energy of young sources.
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