161 articles – 2219 Notices  [english version]
 HAL : in2p3-00656619, version 1
 arXiv : 1010.3477v3
 Astroparticle Physics 35 (2011) 211-222
 Explaining the Cosmic-ray e+/(e− + e+) and ¯p/p Ratios using a Steady-state Injection Model
 (02/11/2011)
 We present a model of cosmic ray (CR) injection into the Galactic space based on recent -ray observations of supernova remnants (SNRs) and pulsar wind nebulae (PWNe) by the Fermi Large Area Telescope (Fermi ) and imaging atmospheric Cherenkov telescopes (IACTs). Steady-state injection of nuclear particles and electrons (e−) from the Galactic ensemble of SNRs, and electrons and positrons (e+) from the Galactic ensemble of PWNe are assumed, with their injection spectra inferred under guidance of -ray observations and recent development of evolution and emission models. The ensembles of SNRs and PWNe are assumed to share the same spatial distributions. Assessment of possible secondary CR contribution from dense molecular clouds interacting with SNRs is also given. CR propagation in the interstellar space is handled by GALPROP. Different underlying source distribution models and Galaxy halo sizes are employed to estimate the systematic uncertaintyof the model. We show that this observation-based model reproduces the positron fraction e+/(e−+e+) and antiproton-to-proton ratio (¯p/p) reported by PAMELA and other previous missions reasonably well, without calling for any speculative sources. A discrepancy remains, however, between the total e− + e+ spectrum measured by Fermi and our model below 20 GeV, for which the potential causes are discussed. Important quantities for Galactic CRs including their energy injection, average lifetime in the Galaxy, and mean gas density along their typical propagation path are also estimated.
 équipe(s) de recherche : GLAST
 Thème(s) : Physique/Astrophysique/Phénomènes cosmiques de haute energiePlanète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
 Mot(s)-clé(s) : ISM: cosmic rays – ISM: supernova remnants – ISM: clouds – -rays: observations
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1010.3477v3
 in2p3-00656619, version 1 http://hal.in2p3.fr/in2p3-00656619 oai:hal.in2p3.fr:in2p3-00656619 Contributeur : Nathalie Martin <> Déposé pour le compte de : Marianne LEMOINE-GOUMARD <> Soumis le : Mardi 10 Janvier 2012, 16:53:42 Dernière modification le : Mercredi 11 Janvier 2012, 09:00:01
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