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      Measurement of the Cosmic Ray\({e}^{+}+{e}^{-}\)Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope

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      Physical Review Letters
      American Physical Society (APS)

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          An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV

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            An excess of cosmic ray electrons at energies of 300-800 GeV.

            Galactic cosmic rays consist of protons, electrons and ions, most of which are believed to be accelerated to relativistic speeds in supernova remnants. All components of the cosmic rays show an intensity that decreases as a power law with increasing energy (for example as E(-2.7)). Electrons in particular lose energy rapidly through synchrotron and inverse Compton processes, resulting in a relatively short lifetime (about 10(5) years) and a rapidly falling intensity, which raises the possibility of seeing the contribution from individual nearby sources (less than one kiloparsec away). Here we report an excess of galactic cosmic-ray electrons at energies of approximately 300-800 GeV, which indicates a nearby source of energetic electrons. Such a source could be an unseen astrophysical object (such as a pulsar or micro-quasar) that accelerates electrons to those energies, or the electrons could arise from the annihilation of dark matter particles (such as a Kaluza-Klein particle with a mass of about 620 GeV).
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              A multidimensional unfolding method based on Bayes' theorem

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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                May 2009
                May 4 2009
                : 102
                : 18
                Article
                10.1103/PhysRevLett.102.181101
                93afa9e9-0ae3-4fba-8b3a-0020cd4defb0
                © 2009

                http://link.aps.org/licenses/aps-default-license

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