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We present the results of structure analyses for a large sample of 426 Lyaemitters (LAEs) at z~2.2 that are observed with HST/ACS and WFC3-IR by deepextra-galactic legacy surveys. We confirm that the merger fraction and theaverage ellipticity of LAE's stellar component are 10-30 % and 0.4-0.6,respectively, that are comparable with previous study results. We successfullyidentify that some LAEs have a spatial offset between Lya and stellar-continuumemission peaks, d_Lya, by ~2.5-4 kpc beyond our statistical errors. To uncoverthe physical origin of strong Lya emission found in LAEs, we investigate Lyaequivalent width (EW) dependences of these three structural parameters, mergerfraction, d_Lya, and ellipticity of stellar distribution in the range ofEW(Lya)=20-250A. Contrary to expectations, we find that merger fraction doesnot significantly increase with Lya EW. We reveal an anti-correlation betweend_Lya and EW(Lya) by Kolmogorov-Smirnov (KS) test. There is a trend that theLAEs with a large Lya EW have a small ellipticity. This is consistent with therecent theoretical claims that Lya photons can more easily escape from face-ondisks having a small ellipticity, due to less inter-stellar gas along the lineof sight, although our KS test indicates that this trend is not statisticallysignificant. Our results of Lya-EW dependence generally support the idea thatan HI column density is a key quantity determining Lya emissivity.

What is the Physical Origin of Strong Lya Emission? I. Demographics of Lya Emitter Structures