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We present first measurements of the evolution of the scatter of the cosmicaverage early-type galaxy color-magnitude relation (CMR) from z=1 to thepresent day, finding that it is consistent with models in which galaxies areconstantly being added to the red sequence through truncation of star formationin blue cloud galaxies. We used a sample of over 700 red sequence,structurally-selected early-type galaxies (defined to have Sersic index >2.5)with redshifts 0<z<1 taken from the Extended Chandra Deep Field South (173galaxies) and the Sloan Digital Sky Survey (550 galaxies), constructingrest-frame U-V colors accurate to <0.04mag. We find that the scatter of the CMRof cosmic average early-type galaxies is ~0.1mag in rest-frame U-V color at0.05<z<0.75, and somewhat higher at z=1. We compared these observations with amodel in which new red sequence galaxies are being constantly added at the raterequired to match the observed number density evolution, and found that thismodel predicts the correct CMR scatter and its evolution. Furthermore, thismodel predicts approximately the correct number density of `blue spheroids' -structurally early-type galaxies with blue colors - albeit with considerablemodel dependence. Thus, we conclude that both the evolution of the numberdensity and colors of the early-type galaxy population paint a consistentpicture in which the early-type galaxy population grows significantly betweenz=1 and the present day through the quenching of star formation in blue cloudgalaxies.

astrophysical journal/the astrophysical journal

The evolution of the scatter of the cosmic average color-magnitude  relation: Demonstrating consistency with the ongoing formation of elliptical  galaxies