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A sample of very high resolution cosmological disk galaxy simulations is usedto investigate the evolution of galaxy disk sizes back to redshift 1 within theLambda CDM cosmology. Artificial images in the rest frame B band are generated,allowing for a measurement of disk scale lengths using surface brightnessprofiles as observations would, and avoiding any assumption that light mustfollow mass as previous models have assumed. We demonstrate that thesesimulated disks are an excellent match to the observed magnitude - sizerelation for both local disks, and for disks at z=1 in the magnitude/mass rangeof overlap. We disentangle the evolution seen in the population as a whole fromthe evolution of individual disk galaxies. In agreement with observations, oursimulated disks undergo roughly 1.5 magnitudes/arcsec^2 of surface brightnessdimming since z=1. We find evidence that evolution in the magnitude - sizeplane varies by mass, such that galaxies with M* > 10^9 M_sun undergo moreevolution in size than luminosity, while dwarf galaxies tend to evolvepotentially more in luminosity. The disks grow in such a way as to stay onroughly the same stellar mass - size relation with time. Finally, due to anevolving stellar mass - SFR relation, a galaxy at a given stellar mass (orsize) at z=1 will reside in a more massive halo and have a higher SFR, and thusa higher luminosity, than a counterpart of the same stellar mass at z=0.

Interpreting the Evolution of the Size - Luminosity Relation for Disk Galaxies from Redshift 1 to the Present