Abstract
We present preliminary results of the estimate of isolated pulsar contribution to the positron and electron interstellar fluxes when a polar cap model is assumed. Pulsars of all ages outside their host remnants have been considered. Cosmic-ray positron observations above a few GeV seem to indicate that an outer gap model is favoured over a polar cap model when the contribution of young pulsars only is taken into account. Here we show that pulsars with ages ranging between 10 kyr and 600 kyr, escaped from their remnants, give a contribution to the interstellar positron flux larger than that proposed in literature for the whole sample of pulsars younger than 10 kyr. Consequently, this result also indicates that outer gap electromagnetic energy losses overcome those at the polar cap. Future, low error e+/(e+ + e-) ratio observations as well as high energy pulsed gamma-ray measurements will allow us to verify this possibility.
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