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Knowing the amount of ionizing photons from young star-forming galaxies is ofparticular importance to understanding the reionization process. Here we reportinitial results of Subaru/Suprime-Cam deep imaging observation of the SSA22proto-cluster region at z=3.09, using a special narrow-band filter to optimallytrace Lyman continuum (LyC) from galaxies at z~3. The unique wide field-of-viewof Suprime-Cam enabled us to search for ionizing photons from 198 galaxies (73Lyman break galaxies (LBGs) and 125 Ly-alpha emitters (LAEs)) withspectroscopically measured redshifts z~3.1. We detected LyC from 7 LBGs, aswell as from 10 LAE candidates. Some of the detected galaxies show significantspatial offsets of LyC from non-ionizing UV emission. For some LBGs theobserved non-ionizing UV to LyC flux density ratios are smaller than valuesexpected from population synthesis models with a standard Salpeter initial massfunction (IMF) with moderate dust attenuation (which is suggested from theobserved UV slopes), even if we assume very transparent IGM along thesightlines of these objects. This implies an intrinsically bluer spectralenergy distribution, e.g, that produced by a top-heavy IMF, for these LBGs. Theobserved flux desity ratios of non-ionizing UV to LyC of 7 detected LBGs rangefrom 2.4 to 23.8 and the median is 6.6. The observed flux density ratios of thedetected LAEs are even smaller than LBGs, if they are truly at z~3.1. We findthat the median value of the flux density ratio for the deteced LBGs suggestthat their escape fractions is likely to be higher than 4%, if the LyC escapeis isotropic. The results imply that some of the LBGs in the proto-cluster atz~3 have the escape fraction significantly higher than that of galaxies (in ageneral field) at z~1 studied previously.

Detections of Lyman Continuum from Star-forming Galaxies at z~3 Through Subaru/Suprime-Cam Narrow-band Imaging