Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2009/07/039
Keywords
ultra high energy cosmic rays; dark matter theory; physics of the early universe
Funding
- European Union through the Marie Curie Research and Training Network [MRTN-CT-2006-035863]
- Australian Research Council [DP0877916]
- Australian Research Council [DP0877916] Funding Source: Australian Research Council
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We extract the positron and electron fluxes in the energy range 10-100GeV by combining the recent data from PAMELA and Fermi LAT. The absolute positron and electron fluxes thus obtained are found to obey the power laws: E-2.65 and E-3.06 respectively, which can be confirmed by the upcoming data from PAMELA. The positron flux appears to indicate an excess at energies E greater than or similar to 50GeV even if the uncertainty in the secondary positron flux is added to the Galactic positron background. This leaves enough motivation for considering new physics, such as annihilation or decay of dark matter, as the origin of positron excess in the cosmic rays.
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