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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-41576

Pato, M; Lattanzi, M; Bertone, G (2010). Discriminating the source of high-energy positrons with AMS-02. Journal of Cosmology and Astroparticle Physics, (12):20-44.

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Abstract

We study the prospects for discriminating between the dark matter (DM) and pulsar origin of the PAMELA positron excess with the Alpha Magnetic Spectrometer AMS-02. We simulate the response of AMS-02 to positrons (and electrons) originating from DM annihilations, and determine the pulsar parameters (spin-down luminosity, distance and characteristic age) that produce a satisfactory fit to the mock AMS-02 data. It turns out that it is always possible to mimic a DM signal with pulsars. Although the fit in some cases requires values of spin-down luminosity and characteristic age different from those of known pulsars in the ATNF and Fermi-LAT catalogues, these catalogues are known to be incomplete, and therefore the pulsar interpretation can hardly be ruled out. We also show that if the positron excess is due to a single pulsar, it is always possible to find a DM candidate that provides a good fit to the mock AMS-02 data. The discrimination between the two scenarios will thus require a better knowledge of the underlying sources, or complementary data.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Theoretical Physics
DDC:530 Physics
Language:English
Date:December 2010
Deposited On:01 Mar 2011 09:00
Last Modified:18 Apr 2014 06:52
Publisher:Institute of Physics Publishing
ISSN:1475-7516
Publisher DOI:10.1088/1475-7516/2010/12/020
Related URLs:http://arxiv.org/abs/1010.5236
Citations:Web of Science®. Times Cited: 8
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