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The precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin.DArk Matter Particle Explorer has reported their first measurement of the e+e-spectrum from 25 GeV to4.6 TeV.This spectrum reveals a tentative peak at ~1.4 TeV,which requires a nearby source of e+e-.In this work,we study the properties of a large nearby dark matter subhalo that accouns for this spectral peak,such as its mass and distance from Earth,for different concentration models.We compare spectra of the sources in 3 FGL with that from DM annihilation in the subhalo,and find ten candidates that have comparable gamma-ray spectra.However,according to the N-body simulation,the probability that such a large subhalo is close enough to Earth is less than 0.1%. 相似文献
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