Distinguish the contribution to high energy electrons/positrons from dark matter and pulsars with DAMPE
arXiv: High Energy Astrophysical Phenomena(2017)
摘要
The Dark Matter Particle Explorer (DAMPE) satellite can detect the spectrum of cosmic ray (CR) electrons and positrons ($e^pm$) from $5$ GeV to $10$ TeV with an unprecedented energy resolution. The previous measurements, such as PAMELA and AMS-02, have shown that either dark matter (DM) or astrophysical sources like pulsars may contribute to high energy CR $e^pm$. In this work, we discuss the possibility of DAMPE to distinguish between the annihilating DM and pulsar contributions. We generate the mock DAMPE $e^pm$ data for DM annihilations to $mu^+mu^-$, $tau^+tau^-$, and all charged leptons, respectively, and require that these data should be consistent with the previous AMS-02 measurements. Then we check that whether the contribution from a nearby known pulsar can reproduce the mock data, by using a goodness of fit test based on the auto-correlation coefficient. For the pulsar case, the latest Fermi-LAT anisotropy limits have also been taken into account. Our results show that the cases of DM annihilations to $tau^+tau^-$ and all charged leptons are difficult to be distinguished from the pulsar cases by the current experiments and DAMPE.
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