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The excesses of the cosmic positron fraction recently measured by PAMELA andthe electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S. indicate theexistence of primary electron and positron sources. The possible explanationsinclude dark matter annihilation, decay, and astrophysical origin, likepulsars. In this work we show that these three scenarios can all explain theexperimental results of the cosmic $e^\pm$ excess. However, it may be difficultto discriminate these different scenarios by the local measurements ofelectrons and positrons. We propose possible discriminations among thesescenarios through the synchrotron and inverse Compton radiation of the primaryelectrons/positrons from the region close to the Galactic center. Takingtypical configurations, we find the three scenarios predict quite differentspectra and skymaps of the synchrotron and inverse Compton radiation, thoughthere are relatively large uncertainties. The most prominent differences comefrom the energy band $10^4\sim 10^9$ MHz for synchrotron emission and $\gtrsim10$ GeV for inverse Compton emission. It might be able to discriminate at leastthe annihilating dark matter scenario from the other two given the highprecision synchrotron and diffuse $\gamma$-ray skymaps in the future.

Discriminating different scenarios to account for the cosmic $e^\pm$ excess by synchrotron and inverse Compton radiation