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We report results of a search for galaxies at z>3 with Lyman continuum (LyC)emission using a narrow-band filter NB359 with Subaru / Suprime-Cam in a ~800arcmin$^2$ blank field around the GOODS-N. We use 103 star-forming galaxies(SFGs) and 8 AGNs with spectroscopic redshifts in a range between 3.06 and 3.5,and 157 photometrically selected z=3.1 Lyman $\alpha$ emitter (LAE) candidatesas the targets. After removing galaxies spectroscopically confirmed to becontaminated by foreground sources, we found two SFGs and one AGN as candidateLyC emitting sources among the targets with spectroscopic redshifts. Among LAEcandidates, five sources are detected in the NB359 image, and three among themmay be contaminated by foreground sources. We compare the sample galaxies inthe GOODS-N with those in the SSA22, where a prominent protocluster at z=3.1 isknown and the LyC search using the same NB359 filter has been made. Frequencyof galaxies with LyC leakage in the SSA22 field may be about two times higherthan the galaxies in the GOODS-N with the sample UV magnitude range, althoughthe numbers of LyC detections in these fields are too small to make astatistically significant conclusion. By combining the sample galaxies in thesefields, we place the 3$\sigma$ upper limits of the observed LyC-to-UV fluxdensity ratio and LyC escape fraction for galaxies at z=3.1 with absolute UVmagnitude $M_{UV} < -18.8$ as ($f_{LyC}/f_{UV})_{obs} < 0.036$ and$f_{esc}^{abs}<8$\%, respectively.

Subaru narrow-band imaging search for Lyman continuum from galaxies at z>3 in the GOODS-N field