Properties of luminous spheroids at redshifts from Keck and HST

摘要

Three new and still on-going surveys that combine the power of spectroscopy oradaptive optics from the Keck Telescopes with HST images are DEEP, AEGIS, and CATS.The advantages of each for the study of distant bulges are accompanied by a few highlights.We find that the vast fraction of luminous distant bulges appear very red, independent of thebulge luminosity, bulge fraction, disk color, and environment. Yet early-type galaxies appearto be relatively young at redshifts, are less numerous then, host many X-ray AGN's withsome that are highly obscured, and have low but increasing dry-dry and dry-wet merger ratesover time.