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We perform a super-resolution analysis of the Subaru Hyper Suprime-Cam (HSC)images to estimate the major merger fractions of z~4-7 dropout galaxies at thebright end of galaxy UV luminosity functions (LFs). Our super-resolutiontechnique improves the spatial resolution of the ground-based HSC images, from~1" to <~0."1, which is comparable to that of the Hubble Space Telescope,allowing us to identify z~4-7 bright major mergers at a high completeness valueof >~90%. We apply the super-resolution technique to 6412, 16, 94, and 13 verybright dropout galaxies at z~4, 5, 6, and 7, respectively, in a UV luminosityrange of L_UV~3-15 L_UV* corresponding to -24<~M_UV<~-22. The major mergerfractions are estimated to be f_merger~10-20% at z~4 and ~50-70% at z~5-7,which shows no f_merger difference compared to those of a control faint galaxysample. Based on the f_merger estimates, we verify contributions of sourceblending effects and major mergers to the bright-end of double power-law (DPL)shape of z~4-7 galaxy UV LFs. While these two effects partly explain the DPLshape at L_UV~3-10 L_UV*, the DPL shape cannot be explained at the very brightend of L_UV>~10 L_UV*, even after the AGN contribution is subtracted. Theresults support scenarios in which other additional mechanisms such asinsignificant mass quenching and low dust obscuration contribute to the DPLshape of galaxy UV LFs.

Galaxy Morphologies Revealed with Subaru HSC and Super-Resolution Techniques I: Major Merger Fractions of L_UV~3-15 L_UV* Dropout Galaxies at z~4-7