DETECTION OF QUIESCENT GALAXIES IN A BICOLOR SEQUENCE FROM Z = 0-2

We investigate the properties of quiescent and star-forming galaxy populations to z ∼ 2 with purely photometric data, employing a novel rest-frame color-selection technique. From the UKIDSS Ultra-Deep Survey Data Release 1, with matched optical and mid-infrared photometry taken from the Subaru-XMM Deep Survey and Spitzer Wide-Area Infrared Extragalactic Survey, respectively, we construct a K-selected galaxy catalog and calculate photometric redshifts. Excluding stars, objects with uncertain z phot solutions, those that fall in bad or incomplete survey regions, and those for which reliable rest-frame colors could not be derived, 30,108 galaxies with K < 22.4 (AB) and z phot ≤ 2.5 remain. The galaxies in this…