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We have recently discovered five Lyman continuum leaking galaxies at z~0.3,selected for their compactness, intense star-formation, and high [OIII]/[OII]ratio (Izotov et al. 2016ab). Here we derive their ionizing photon productionefficiency, a fundamental quantity for inferring the number of photonsavailable to reionize the Universe, for the first time for galaxies withconfirmed strong Lyman continuum escape (fesc~6-13%). We find an ionizingphoton production per unit UV luminosity, which is a factor 2-6 times higherthan the canonical value when reported to their observed UV luminosity. Aftercorrection for extinction this value is close to the canonical value. Theproperties of our five Lyman continuum leakers are found to be very similar tothose of the confirmed z=3.218 leaker Ion2 from de Barros et al. (2016) andvery similar to those of typical star-forming galaxies at z>~6. Our resultssuggest that UV bright galaxies at high-z such as Lyman break galaxies can beLyman continuum leakers and that their contribution to cosmic reionization maybe underestimated.

The ionizing photon production efficiency of compact z~0.3 Lyman continuum leakers and comparison with high redshift galaxies