Intrinsic Shape of Star-Forming BzK Galaxies II: Rest-Frame UV and
  Optical Structures in GOODS-South and SXDS
  (Abridge) We study statistical intrinsic shape of star-forming BzK galaxies
(sBzK galaxies) at z~2 in both rest-frame UV and rest-frame optical
wavelengths. The sBzK galaxies are selected down to K(AB)=24.0 mag in the
GOODS-South and SXDS fields, where high-resolution images from Hubble Space
Telescope are publicly available. 57% (583) of all 1028 galaxies in GOODS-S
show a single component in the ACS/F850LP image. As WFC3/F160W images cover
only some part of GOODS-S and SXDS, 724/1028 and 2500/29835 sBzK galaxies in
the GOODS-S and SXDS have the WFC3 coverage. 86% (626) and 82% (2044) of the
sBzK galaxies in WFC3/F160W images appear as a single component in the GOODS-S
and SXDS, respectively. Larger fraction of single-component objects in F850LP
images represents multiple star-forming regions in galaxies, while they are not
so obvious in the F160W image which appears smoother. Most of the
single-component sBzK galaxies show S\'ersic indices of n=0.5-2.5, in agreement
with those of local disk galaxies. Their effective radii are 1.0-3.0 kpc and
1.5-4.0 kpc in F850LP and F160W images, respectively, regardless of the
observed fields. Stellar surface mass density of the sBzK galaxies is also
comparable to that of the local disk galaxies. However, the intrinsic shape of
sBzK galaxies is not a round disk as seen in the local disk galaxies. By
comparing apparent axial ratio (b/a) distributions of the sBzK galaxies with
those by assuming tri-axial model with axes A>B>C, we found their intrinsic
face-on B/A ratios peak at B/A=0.70 and B/A=0.77-0.79 in the rest-frame UV and
optical, respectively and are statistically more bar-like than that of the
local disk galaxies. The intrinsic edge-on C/A ratios in both rest-frame UV and
optical wavelengths peak at 0.26, which is slightly larger than that of the
local disk galaxies.
