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Using high-resolution HST/Wide Field Camera 3 F125W imaging from theCANDELS-COSMOS field, we report the the structural and morphological propertiesof Extremely Red Objects (EROs) at $z\sim1$. Based on the UVJ color criteria,we separate EROs into two types: old passive galaxies (OGs) and dustystar-forming galaxies (DGs). For a given stellar mass, we find that the meansize of OGs (DGs) is smaller by a factor of $\sim2$ (1.5) than that ofpresent-day early-type (late-type) galaxies at rest-frame optical wavelength.We derive the average effective radii of OGs and DGs, corresponding to$2.09\pm1.13$ kpc and $3.27\pm1.14$ kpc, respectively. Generally, The DGs areheterogeneous, with mixed features including bulges, disks, and irregularstructures, with relatively high $M_{\rm 20}$, small size and low $G$, whileOGs are elliptical-like compact morphologies with lower $M_{\rm 20}$, largersize and higher $G$, indicating the more concentrated and symmetric spatialextent of stellar population distribution in OGs than DGs. The findings implythat OGs and DGs have different evolutionary processes, and the minor mergerscenario is the most likely mechanism for the structural properties of OGs.However, the size evolution of DGs is possibly due to the secular evolution ofgalaxies.

Morphology and structure of extremely red objects at $z\sim1$ in the CANDELS-COSMOS field