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Träfflista för sökning "WFRF:(Gaggero Daniele) srt2:(2013)"

Sökning: WFRF:(Gaggero Daniele) > (2013)

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1.
  • Di Bernardo, Giuseppe, et al. (författare)
  • “Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications”
  • 2013
  • Ingår i: Journal of Cosmology and Astroparticle Physics. - : IOP Publishing. - 1475-7516 .- 1475-7516. ; 2013:3
  • Tidskriftsartikel (refereegranskat)abstract
    • A multichannel analysis of cosmic ray electron and positron spectra and of the diffuse synchrotron emission of the Galaxy is performed by using the DRAGON code. This study is aimed at probing the interstellar electron source spectrum down to E ~ 1 GeV and at constraining several propagation parameters. We find that above 4 GeV the electron source spectrum is compatible with a power-law of index -2.5. Below 4 GeV instead it must be significantly suppressed and the total lepton spectrum is dominated by secondary particles. The positron spectrum and fraction measured below a few GeV are consistently reproduced only within low reacceleration models. We also constrain the scale-height zt of the cosmic-ray distribution using three independent (and, in two cases, original) arguments, showing that values of z_t < 2 kpc are excluded. This result may have strong implications for particle dark matter searches.
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2.
  • Gaggero, Daniele, 1981, et al. (författare)
  • “Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station”
  • 2013
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 111:2
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the compatibility of Alpha Magnetic Spectrometer (AMS-02) data on the cosmic-ray (CR) positron fraction with data on the CR electron and positron spectra provided by PAMELA and Fermi LAT. We do that in terms of a novel propagation model in which sources are distributed in spiral arm patterns in agreement with astrophysical observations. While former interpretations assumed an unrealistically steep injection spectrum for astrophysical background electrons, the enhanced energy losses experienced by CR leptons due to the larger average source distance from Earth allow us to reproduce the data with harder injection spectra as expected in a shock acceleration scenario. Moreover, we show that in this approach, and accounting for AMS-02 results, the contribution of nearby accelerators to the fluxes at very high energy can be significantly reduced, thus avoiding any tension with anisotropy upper limits.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Di Bernardo, Giusepp ... (2)
Evoli, Carmelo, 1980 (2)
Grasso, Dario, 1961 (2)
Maccione, Luca, 1981 (2)
Gaggero, Daniele, 19 ... (1)
Gaggero, Daniele, 19 ... (1)
Lärosäte
Göteborgs universitet (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2013 (2)Ta bort avgränsningen

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