WHAT COULD WE LEARN FROM A SHARPLY FALLING POSITRON FRACTION?
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 794, no 2, 168- p.Article in journal (Refereed) Published
Recent results from the AMS-02 data have confirmed that the cosmic-ray positron fraction increases with energy between 10 and 200 GeV. This quantity should not exceed 50%, and it is hence expected that it will either converge toward 50% or fall. We study the possibility that future data may show the positron fraction dropping down abruptly to the level expected with only secondary production, and forecast the implications of such a feature in term of possible injection mechanisms that include both dark matter and pulsars. Were a sharp steepening to be found, rather surprisingly, we conclude that pulsar models would do at least as well as dark matter scenarios in terms of accounting for any spectral cut-off.
Place, publisher, year, edition, pages
2014. Vol. 794, no 2, 168- p.
acceleration of particles, astroparticle physics, cosmic rays, dark matter, ISM: supernova remnants
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-109266DOI: 10.1088/0004-637X/794/2/168ISI: 000343085800072OAI: oai:DiVA.org:su-109266DiVA: diva2:765150