Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-09
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, to appear in Astronomy & Astrophysics Letters
Scientific paper
10.1051/0004-6361:20021012
We present the redshift distribution of a complete sample of 480 galaxies with Ks<20 distributed over two independent fields covering a total area of 52 arcmin^2. The redshift completeness is 87% and 98% respectively with spectroscopic and high-quality and tested photometric redshifts. The redshift distribution of field galaxies has a median redshift z_{med}\sim 0.80, with \sim 32% and \sim 9% of galaxies at z>1 and z>1.5 respectively. A ``blind'' comparison is made with the predictions of a set of the most recent LambdaCDM hierarchical merging and pure luminosity evolution (PLE) models. The hierarchical merging models overpredict and underpredict the number of galaxies at low-z and high-z respectively, whereas the PLE models match the median redshift and the low-z distribution, still being able to follow the high-z tail of N(z). We briefly discuss the implications of this comparison and the possible origins of the observed discrepancies. We make the redshift distribution publicly available.
Broadhurst Tom
Cimatti Andrea
Cristiani Stefano
D'Odorico Sandro
Daddi Emanuele
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