Galactic electrons and positrons at the Earth: new estimate of the primary and secondary fluxes

  title={Galactic electrons and positrons at the Earth: new estimate of the primary and secondary fluxes},
  author={Timur Delahaye and Julien Lavalle and Roberto A. Lineros and Fiorenza Donato and Nicolao Fornengo},
  journal={Astronomy and Astrophysics},
Context. The so-called excess of cosmic ray (CR) positrons observed by the PAMELA satellite up to 100 GeV has led to many interpretation attempts, from standard astrophysics to a possible exotic contribution from dark matter annihilation or decay. The Fermi data subsequently obtained about CR electrons and positrons in the range 0.02–1 TeV, and HESS data above 1 TeV have provided additional information about the leptonic content of local Galactic CRs. Aims. We analyse predictions of the CR… Expand
Impact of the spectral hardening of TeV cosmic rays on the prediction of the secondary positron flux
The rise in the cosmic-ray positron fraction measured by the PAMELA satellite is likely due to the presence of astrophysical sources of positrons, e.g. pulsars, on the kpc scale around the Earth.Expand
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The cosmic-ray flux of positrons is measured with high precision by the space-borne particle spectrometer AMS-02. The hypothesis that pulsar wind nebulae (PWNe) can significantly contribute to theExpand
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Recent data on Galactic cosmic-ray (CR) leptons and hadrons gave rise to two exciting problems: on the lepton side, the origin of the rise of the CR positron fraction e+/(e- + e+) at ~10 - 300 GeV ofExpand
Emission of cosmic rays from Pulsar wind nebulae
  • Xuer Dai
  • Physics
  • Journal of Physics: Conference Series
  • 2021
The goal of the paper is to interpret AMS-02 positron data. Most of the positrons come from secondary production which can fit well the data below 10 GeV. However, above 10 GeV the positron fluxExpand


Galactic secondary positron flux at the Earth
Context. Secondary positrons are produced by spallation of cosmic rays within the interstellar gas. Measurements have been typically expressed in terms of the positron fraction, which exhibits anExpand
Electrons and positrons in the galactic cosmic rays.
In the framework of the proposed two-component approach, it is possible to explain all the locally observed features of the energy spectrum of cosmic ray electrons from sub-GeV to TeV energies and the reported increase of the positron content in the Bux above 10 GeV. Expand
An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV
It is found that the positron fraction increases sharply over much of that range, in a way that appears to be completely inconsistent with secondary sources, and is concluded that a primary source, be it an astrophysical object or dark matter annihilation, is necessary. Expand
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Recent results from the PAMELA satellite indicate the presence of a large flux of positrons (relative to electrons) in the cosmic ray spectrum between approximately 10 and 100 GeV. As annihilatingExpand
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Inhomogeneity in the Supernova Remnant Distribution as the Origin of the PAMELA Anomaly
Recent measurements of the positron/electron ratio in the cosmic ray (CR) flux exhibits an apparent anomaly, whereby this ratio increases between 10 and 100 GeV. We show that inhomogeneity of CRExpand
Observation of an anomalous positron abundance in the cosmic radiation
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Measurements of the energy spectra of negative electrons and positrons have been performed with the High-Energy Antimatter Telescope (HEAT) in two balloon flights—1994 May from Fort Sumner, NM, andExpand
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Origin of the positron excess in cosmic rays.
  • P. Blasi
  • Physics, Medicine
  • Physical review letters
  • 2009
We show that the positron excess measured by the PAMELA experiment in the region between 10 and 100 GeV may well be a natural consequence of the standard scenario for the origin of Galactic cosmicExpand