Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-12-19
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
5 pages, 3 figures Contribution to 2009 Fermi Symposium - eConf Proceedings C091122
Scientific paper
The Fermi Large Area Telescope (LAT) has provided the measurement of the high energy cosmic ray electrons plus positrons (CRE) spectrum with unprecedented accuracy form 20 GeV to 1 TeV. Recently this range has been extended down to ~ 7 GeV. The spectrum shows no prominent features and it is significantly harder than that inferred from several previous experiments. While the reported Fermi-LAT data alone may be interpreted in terms of a single (electron dominated) Galactic component, when combined with other complementary experimental results, specifically the CRE spectrum measured by H.E.S.S., and especially the positron fraction measured by PAMELA, an additional electron and positron component seems to be required. We show that the acceleration of electron-positron pairs in Galactic pulsars may offer a natural (though not unique) interpretation of all those results.
Bernardo Giuseppe Di
Fermi-LAT collaboration for the
Gaggero Daniele
Grasso Dario
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