Using state-of-the-art adaptive mesh refinement cosmological hydrodynamic simulations with a spatial resolution of 0.15 h-1kpc on a cosmological volume (20 h-1Mpc), we investigate the sizes of galaxies at z=3 in the standard cold dark matter model where re

Fig.3.—Rotationvelocitycurvesforthethreegalaxieslabeled“1”,“2”and“3”inFig.1.Thesolidcurvesrepresentrotationvelocitiesduetoallthematterwithinagivengalacto-centricradius,whilethedottedcurvesshowthoseduetostellarmassonly.Thevirialmassesofthethreegalaxiesare8×1011,4×1011and1×1011M⊙,respectively.