Volume 391, Number 1, August III 2002
|Page(s)||L1 - L5|
|Published online||29 July 2002|
Letter to the Editor
The K20 survey*
IV. The redshift distribution of galaxies: A test of galaxy formation models
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
2 INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
3 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
4 INAF, Osservatorio Astronomico di Roma, via Dell'Osservatorio 2, Monteporzio, Italy
5 Dipartimento di Astronomia, Università “La Sapienza”, Roma, Italy
6 Racah Institute for Physics, The Hebrew University, Jerusalem, 91904 Israel
7 INAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34131 Trieste, Italy
Corresponding author: A. Cimatti, email@example.com
Accepted: 8 July 2002
We present the redshift distribution of a complete sample of 480 galaxies with distributed over two independent fields covering a total area of 52 arcmin2. 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 , with ~32% and ~9% of galaxies at and respectively. A “blind” comparison is made with the predictions of a set of the most recent ΛCDM 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 . We briefly discuss the implications of this comparison and the possible origins of the observed discrepancies. We make the redshift distribution publicly available.
Key words: galaxies: evolution / galaxies: formation
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.