Mature gamma-ray pulsars as possible sources of Galactic positrons

We consider a possible contribution of mature γ-ray pulsars to cosmic ray positrons based on the revised outer gap model, e± pairs in the pulsars magnetosphere are produced by the cascade of e± pairs through synchrotron radiation of the return current from the outer gap. Using a Monte Carlo method, we generate a sample of mature gamma-ray pulsars and estimate the spatial distribution. Using the diffuse model of cosmic rays propagation, we calculated the positron fraction, the result indicates that the pulsar contribution to the cosmic ray positrons peaks at about 10 GeV and the observed e+/(e-+e+) ratio can be explain in this model