Evolution of the luminosity function and colours of galaxies in a Λ cold dark matter universe |
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| Authors: | K. Nagamine &dagger ,M. Fukugita,R. Cen,J.P. Ostriker |
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| Affiliation: | 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 |
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| 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 . |
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| Keywords: | galaxies: evolution galaxies: formation galaxies: fundamental parameters galaxies: luminosity function, mass function cosmology: theory |
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