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Subaru/SuprimeCam narrowband photometry of the SSA22 field reveals thepresence of four Lyman continuum (LyC) candidates among a sample of 14 AGN. Twoshow offsets and likely have stellar LyC in nature or are foregroundcontaminants. The remaining two LyC candidates are Type I AGN. We argue thatthe average LyC escape fraction of high redshift low luminosity AGN is notlikely to be unity, as often assumed in the literature. From direct measurementwe obtain the average LyC-to-UV flux density ratio and ionizing emissivity fora number of AGN classes and find it at least a factor of two lower than valuesobtained assuming f_esc = 1. Comparing to recent Ly{\alpha} forestmeasurements, AGNs at redshift z~3 make up at most ~12% and as little as ~5% ofthe total ionizing budget. Our results suggest that AGNs are unlikely todominate the ionization budget of the Universe at high redshifts.

Lyman continuum leaking AGN in the SSA22 field