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We measured evolution of the $K$-band luminosity function and stellar massfunction for red and blue galaxies at $z<1.2$ using a sample of 353 594 $I<24$galaxies in 8.26 square degrees of Bo\"otes. We addressed several sources ofsystematic and random error in measurements of total galaxy light, photometricredshift and absolute magnitude. We have found that the $K$-band luminositydensity for both red and blue galaxies increased by a factor of 1.2 from$z\sim1.1$ to $z\sim0.3$, while the most luminous red (blue) galaxies decreasedin luminosity by 0.19 (0.33) mag or $\times0.83 (0.74)$. These results areconsistent with $z<0.2$ studies while our large sample size and area result insmaller Poisson and cosmic variance uncertainties than most $z >0.4$ luminosityand mass function measurements. Using an evolving relation for $K$-band mass tolight ratios as a function of $(B-V)$ color, we found a slowly decreasing rateof growth in red galaxy stellar mass density of $\times2.3$ from $z\sim1.1$ to$z\sim0.3$, indicating a slowly decreasing rate of migration from the bluecloud to the red sequence. Unlike some studies of the stellar mass function, wefind that massive red galaxies grow by a factor of $\times1.7$ from $z\sim1.1$to $z\sim0.3$, with the rate of growth due to mergers decreasing with time.These results are comparable with measurements of merger rates and clustering,and they are also consistent with the red galaxy stellar mass growth implied bycomparing $K$-band luminosity evolution with the fading of passive stellarpopulation models.

Evolution of the Stellar Mass Function and Infrared Luminosity Function of Galaxies since $z = 1.2$