Stellar mass-redshift/age distribution of the GDDS galaxies

Stellar mass-redshift/age distribution of the GDDS galaxies. The color code (see key on lower left) show the observed K-band magnitude of the galaxies. Circle/star shape symbols denote objects respectively redder or bluer in V-I than a model Sbc spiral galaxy template. Symbol size is keyed to the I-band magnitude. The horizontal line denotes the characteristic Schechter mass scale in the local universe. These results show that red, old galaxies make a large contribution (30%) to the stellar mass in the Universe at the redshift range of 1.2 < z < 1.8.