%0 Journal Article
%T Evolution of the Luminosity Function and Colors of Galaxies in a Lambda-CDM Universe
%A Kentaro Nagamine
%A Masataka Fukugita
%A Renyue Cen
%A Jeremiah P. Ostriker
%J Physics
%D 2001
%I arXiv
%R 10.1046/j.1365-8711.2001.04905.x
%X The luminosity function of galaxies is derived from a cosmological hydrodynamic simulation of a Lambda cold dark matter (CDM) universe with the aid of a stellar population synthesis model. At z=0, the resulting B band luminosity function has a flat faint end slope of \alpha \approx -1.15 with the characteristic luminosity and the normalization in a fair agreement with observations, while the dark matter halo mass function is steep with a slope of \alpha \approx -2. The colour distribution of galaxies also agrees well with local observations. We also discuss the evolution of the luminosity function, and the colour distribution of galaxies from z=0 to 5. A large evolution of the characteristic mass in the stellar mass function due to number evolution is compensated by luminosity evolution; the characteristic luminosity increases only by 0.8 mag from z=0 to 2, and then declines towards higher redshift, while the B band luminosity density continues to increase from z=0 to 5 (but only slowly at z>3).
%U http://arxiv.org/abs/astro-ph/0102180v2