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“Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications”

Journal article
Authors Giuseppe Di Bernardo
Carmelo Evoli
Daniele Gaggero
Dario Grasso
Luca Maccione
Published in Journal of Cosmology and Astroparticle Physics
Volume 2013
Issue 3
Pages artikel nr 036
ISSN 1475-7516
Publication year 2013
Published at Department of Physics (GU)
Pages artikel nr 036
Language en
Links http://dx.doi.org/10.1088/1475-751...
https://gup.ub.gu.se/file/129469
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology, High energy astrophysics

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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