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We use the spatially-resolved, multi-band photometry in the GOODS South fieldacquired by the CANDELS project to constrain the nature of candidate Lymancontinuum (LyC) emitters at redshift z~3.7 identified using ultra-deep imagingbelow the Lyman limit (1-sigma limit of ~30 AB in a 2" diameter aperture). In18 candidates, out of a sample of 19 with flux detected at >3-sigma level, thelight centroid of the candidate LyC emission is offset from that of the LBG byup to 1.5". We fit the SED of the LyC candidates to spectral populationsynthesis models to measure photometric redshifts and the stellar populationparameters. We also discuss the differences in the UV colors between the LBGand the LyC candidates, and how to estimate the escape fraction of ionizingradiation (f_esc) in cases, like in most of our galaxies, where the LyCemission is spatially offset from the host galaxy. In all but one case weconclude that the candidate LyC emission is most likely due to lower redshiftinterlopers. Based on these findings, we argue that the majority of similarmeasurements reported in the literature need further investigation before itcan be firmly concluded that LyC emission is detected. Our only surviving LyCcandidate is a LBG at z=3.795, which shows the bluest (B-V) color among LBGs atsimilar redshift, a stellar mass of M~2 x 10^9 Msun, weak interstellarabsorption lines and a flat UV spectral slope with no Lya in emission. Weestimate its f_esc to be in the range 25%-100%, depending on the dust andintergalactic attenuation.

On The Detection Of Ionizing Radiation Arising From Star-Forming Galaxies At Redshift z ~ 3-4 : Looking For Analogs Of "Stellar Reionizers"