Is the PAMELA anomaly caused by the supernova explosions near the Earth?

Details Is the PAMELA anomaly caused by the supernova explosions near the Earth? Is the PAMELA anomaly caused by the supernova explosions near the Earth?

2009-03-31

arxiv.org/abs/0903.5298v3

Phys.Rev.D80:063003,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.80.063003

We show that the anomaly of the positron fraction observed by the PAMELA experiment can be attributed to recent supernova explosion(s) in a dense gas cloud (DC) near the Earth. Protons are accelerated around the supernova remnant (SNR). Electrons and positrons are created through hadronic interactions inside the DC. Their spectrum is harder than that of the background because the SNR spends much time in a radiative phase. Our scenario predicts that the anti-proton flux dominates that of the background for >~100 GeV. We compare the results with observations (Fermi, HESS, PPB-BETS, and ATIC).

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