Large Size Scatter of Passively Evolving Lensed Galaxies at z~2 in CLASH
  In a systematic search over 11 cluster fields from Cluster Lensing And
Supernova survey with Hubble (CLASH) we identify ten passively evolving massive
galaxies at redshift z~2.We derive the stellar properties of these galaxies
using HST WFC3/ACS multiband data, together with Spitzer IRAC observations. We
also deduce the optical rest-frame effective radius of these high redshift
objects. The derived stellar masses and measured effective radii have been
corrected by the lensing magnification factors, which are estimated by simply
adopting the spherical NFW model for the foreground cluster lens. The observed
near-IR images, obtained by HST WFC3 camera with high spatial resolution and
lensed by the foreground clusters, enable us to study the structures of such
systems. Nine out of ten galaxies have on average three times smaller effective
radius than local ETGs of similar stellar masses, in agreement with previous
works at redshift 1.5 < z < 2.5. Combined with literature data for z~2, we find
that the mass-normalized effective radius scales with redshift as re/M^0.56
\propto (1 + z)^{-1.13}. We confirm that their size distribution shows a large
scatter: from normal size to ~5 times smaller compared to local ETGs with
similar stellar masses. The 1-{\sigma} scatter {\sigma}_{logre} of the size
distribution is 0.22 and 0.34 at z~1.6 and z~2.1,respectively.The observed
large size scatter has to be carefully taken into account in galaxy evolution
model predictions.
