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2007MNRAS.380..585C - Mon. Not. R. Astron. Soc., 380, 585-595 (2007/September-2)
The evolution of the near-infrared galaxy luminosity function and colour bimodality up to z ≃ 2 from the UKIDSS Ultra Deep Survey Early Data Release.
CIRASUOLO M., McLURE R.J., DUNLOP J.S., ALMAINI O., FOUCAUD S., SMAIL I., SEKIGUCHI K., SIMPSON C., EALES S., DYE S., WATSON M.G., PAGE M.J. and HIRST P.
Abstract (from CDS):
In agreement with previous studies, we find that the characteristic luminosity of the near-IR LF brightens by ≃1 mag between z = 0 and z ≃ 2, while the total density decreases by a factor of ≃2. Using the rest-frame (U - B) colour to split the sample into red and blue galaxies, we confirm the classic luminosity-dependent colour bimodality at z ≲ 1. However, the strength of the colour bimodality is found to be a decreasing function of redshift, and seems to disappear by z ≳ 1.5. Due to the large size of our sample, we are able to investigate the differing cosmological evolution of the red and blue galaxy populations. It is found that the space density of the brightest red galaxies (MK≤ - 23) stays approximately constant with redshift, and that these sources dominate the bright end of the LF at redshifts z ≲ 1. In contrast, the brightening of the characteristic luminosity and mild decrease in space density displayed by the blue galaxy population leads them to dominate the bright end of the LF at redshifts z ≳ 1.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): galaxies: evolution - galaxies: formation - cosmology: observations
Simbad objects: 4
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