Galaxy Evolution in COMBO-17 and GEMS

I present two new surveys and some of their results on galaxy evolution. COMBO-17 is a 17-band optical imaging survey which provides photometric redshifts of extremely high accuracy for 40,000 galaxies and 500 QSOs. GEMS is the largest HST colour mosaic and covers 1/4 of COMBO-17. With COMBO-17 we have quantified how differently red and blue galaxies have evolved from redshift 1 until today. GEMS demonstrates how disks have lost surface brightness while growing inside out over the same period. In COMBO-17 we have measured the evolution of very faint quasars across all redshifts for the first time, while in GEMS we have found that their host galaxies show recent star formation irrespective of their morphology. Both surveys will make substantial releases of reduced data in March'04.