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We study structure of star-forming galaxies at z~2 in GOODS-N field selectedas sBzK galaxies down to K_{AB} <24.0 mag. Among 1029 sBzK galaxies, 551galaxies (54%) show a single component in ACS/F850LP image obtained with theHubble Space Telescope; the rest show multiple components. We fit thesingle-component sBzK galaxies with the single S\'ersic profile using theACS/F850LP image and find that a majority of them (64%) show S\'ersic index ofn=0.5-2.5, indicating that they have a disk-like structure. The resultingeffective radii typically range from 1.0 to 3.0 kpc in the rest-frame UVwavelength. After correcting the effective radii to those in the rest-frameoptical wavelength, we find that the single-component sBzK galaxies locate inthe region where the local and z~1 disk galaxies distribute in the stellarmass-size diagram, suggesting comparable surface stellar mass density betweenthe sBzK and z~0-1 disk galaxies. All these properties suggest that thesingle-component sBzK galaxies are progenitors of the present-day diskgalaxies. However, by studying their intrinsic shape through comparison betweenthe observed distribution of apparent axial ratios and the distribution fortriaxial models with axes (A>B>C), we find that the mean B/A ratio is0.61^{+0.05}_{-0.08} and disk thickness C/A is 0.28^{+0.03}_{-0.04}. Thisindicates that the single-component sBzK galaxies at z~2 have a bar-like oroval shape rather than a round disk shape. The shape seems to resemble to abar/oval structure that form through bar instability; if it is the case, theintrinsic shape may give us a clue to understand dynamical evolution ofbaryonic matter in a dark matter halo.

Intrinsic Shape of Star-Forming BzK Galaxies at z~2 in GOODS-N