Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-01-12
Astrophysical Journal 700 (2009) L170-173
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
11 pages, 3 figures and 1 table. Accepted for publication in ApJL
Scientific paper
10.1088/0004-637X/700/2/L170
Supernova remnants have long been regarded as sources of the Galactic cosmic rays up to petaelectronvolts, but convincing evidence is still lacking. In this work we explore the common origin of the subtle features of the cosmic ray spectra, such as the knee of cosmic ray spectra and the excesses of electron/positron fluxes recently observed by ATIC, H.E.S.S., Fermi-LAT and PAMELA. Numerical calculation shows that those features of cosmic ray spectra can be well reproduced in a scenario with e$^+$e$^-$ pair production by interactions between high energy cosmic rays and background photons in an environment similar to the young supernova remnant. The success of such a coherent explanation serves in turn as an evidence that at least a portion of cosmic rays might be accelerated at young supernova remnants.
Bi Xiao-Jun
Fan Chao
Hu Hong-bo
Wang Bo
Yuan Qiang
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