Evolution of the Luminosity Function and Colors of Galaxies in a Lambda-CDM Universe

Abstract

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 α\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 α\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).

6 pages, including 4 figures, mn2e style. Accepted to MNRAS pink pages

References in corpus (2)

• The Luminosity Function of Galaxies in SDSS Commissioning Data
• The Luminosity Function Of Field Galaxies And Its Evolution Since z=1

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