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We aim to investigate the effect of the escaping ionizing radiation on thecolor selection of high redshift galaxies and identify candidate Lymancontinuum (LyC) emitters. The intergalactic medium prescription of Inoue etal.(2014) and galaxy synthesis models of Bruzual&Charlot (2003) have been usedto properly treat the ultraviolet stellar emission, the stochasticity of theintergalactic transmission and mean free path in the ionizing regime. Colortracks are computed by turning on/off the escape fraction of ionizingradiation. At variance with recent studies, a careful treatment of IGMtransmission leads to no significant effects on the high-redshift broad-bandcolor selection. The decreasing mean free path of ionizing photons withincreasing redshift further diminishes the contribution of the LyC tobroad-band colors. We also demonstrate that prominent LyC sources can beselected under suitable conditions by calculating the probability of a nullescaping ionizing radiation. The method is applied to a sample of galaxiesextracted from the GOODS-S field. A known LyC source at z=3.795 is successfullyrecovered as a LyC emitter candidate and another convincing candidate atz=3.212 is reported. A detailed analysis of the two sources (including theirvariability and morphology) suggests a possible mixture of stellar andnon-stellar (AGN) contribution in the ultraviolet. Conclusions: Classicalbroad-band color selection of 2.5<z<4.5 galaxies does not prevent the inclusionof LyC emitters in the selected samples. Large fesc in relatively brightgalaxies (L>0.1L*) could be favored by the presence of a faint AGN not easilydetected at any wavelength. A hybrid stellar and non-stellar (AGN) ionizingemission could coexist in these systems and explain the tensions found amongthe UV excess and the stellar population synthesis models reported inliterature.

Peering through the holes: the far UV color of star-forming galaxies at z~3-4 and the escaping fraction of ionizing radiation