Discriminating the source of high-energy positrons with AMS-02

被引:22
作者
Pato, Miguel [1 ,2 ,3 ]
Lattanzi, Massimiliano [4 ,5 ]
Bertone, Gianfranco [1 ,2 ]
机构
[1] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland
[2] Univ Paris 06, CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France
[3] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy
[4] Univ Roma La Sapienza, Int Ctr Relativist Astrophys, I-00185 Rome, Italy
[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2010年 / 12期
关键词
dark matter experiments; cosmic ray theory; cosmic ray experiments; pulsar magnetosphere; COSMIC-RAY ELECTRONS; DARK-MATTER; SPECTRUM; FRACTION; LIGHT;
D O I
10.1088/1475-7516/2010/12/020
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页数:23
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