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We present the color-magnitude and color-stellar mass diagrams for galaxieswith z_phot < ~2, based on a K < 22 (AB) catalog of the Extended Chandra DeepField South (ECDFS) from the MUltiwavelength Survey by Yale-Chile (MUSYC). Ourmain sample of 7840 galaxies contains 1297 M_* > 10^11 M_Sol galaxies in therange 0.2 < z_phot < 1.8. We show empirically that this catalog isapproximately complete for M_* > 10^11 M_Sol galaxies for z_phot < 1.8. Forthis mass-limited sample, we show that the locus of the red sequencecolor-stellar mass relation evolves as Del(u-r) ~ (-0.44+/-0.02) z_phot forz_phot < ~1.2. For z_phot > ~1.3, however, we are no longer able to reliablydistinguish red and blue subpopulations from the observed color distribution;we show that this would require much deeper near infrared data. At 1.5 < z_phot<1.8, the comoving number density of M_* > 10^11 M_Sol galaxies is ~50% of thelocal value, with a red fraction of ~33%. Making a parametric fit to theobserved evolution, we find n_tot(z) ~ (1+z_phot)^(-0.52+/-0.12(+/-0.20)). Wefind stronger evolution in the red fraction: f_red(z) ~(1+z_phot)^(-1.17+/-0.18(+/-0.21)). Through a series of sensitivity analyses,we show that the most important sources of systematic error are: 1. systematicdifferences in the analysis of the z~0 and z>>0 samples; 2. systematic effectsassociated with details of the photometric redshift calculation; and 3.uncertainties in the photometric calibration. With this in mind, we show thatour results based on photometric redshifts are consistent with a completelyindependent analysis which does not require redshift information for individualgalaxies. Our results suggest that, at most, 1/5 of local red sequence galaxieswith M_* >10^11 M_Sol were already in place at z ~ 2.

astrophysical journal/the astrophysical journal

The Rise of Massive Red Galaxies: the color-magnitude and color-stellar  mass diagrams for z < ~2 from the MUltiwavelength Survey by Yale-Chile  (MUSYC)