Evolution of the luminosity function and colours of galaxies in a Λ cold dark matter universe |
| |
| Authors: | K Nagamine † M Fukugita R Cen JP Ostriker |
| |
| Institution: | 1Joseph Henry Laboratories, Physics Department, Princeton University, Princeton, NJ 08544, USA;2Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 2778582, Japan;3Institute for Advanced Study, Princeton, NJ 08540, USA;4Princeton University Observatory, Princeton, NJ 08544, USA |
| |
| Abstract: | The luminosity function of galaxies is derived from a cosmological hydrodynamic simulation of a Λ cold dark matter universe with the aid of a stellar population synthesis model. At  , the resulting B -band luminosity function has a flat faint-end slope of  with the characteristic luminosity and the normalization in fair agreement with observations, while the dark matter halo mass function is steep with a slope of  . 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  to 5. A large evolution of the characteristic mass in the stellar mass function as a result of number evolution is compensated by luminosity evolution; the characteristic luminosity increases only by 0.8 mag from  to 2, and then declines towards higher redshift, while the B -band luminosity density continues to increase from  to 5 (but only slowly at  . |
| |
| Keywords: | galaxies: evolution galaxies: formation galaxies: fundamental parameters galaxies: luminosity function mass function cosmology: theory |
|
|
