EDP Sciences
Free access
Volume 439, Number 3, September I 2005
Page(s) 863 - 876
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20041961

A&A 439, 863-876 (2005)
DOI: 10.1051/0004-6361:20041961

The VIMOS-VLT deep survey

Evolution of the galaxy luminosity function up to z = 2 in first epoch data
O. Ilbert1, L. Tresse1, E. Zucca2, S. Bardelli2, S. Arnouts1, G. Zamorani2, L. Pozzetti2, D. Bottini3, B. Garilli3, V. Le Brun1, O. Le Fèvre1, D. Maccagni3, J.-P. Picat4, R. Scaramella5, M. Scodeggio3, G. Vettolani5, A. Zanichelli5, C. Adami1, M. Arnaboldi6, M. Bolzonella7, A. Cappi2, S. Charlot8, 9, T. Contini4, S. Foucaud3, P. Franzetti3, I. Gavignaud4, 10, L. Guzzo11, A. Iovino11, H. J. McCracken9, 12, B. Marano7, C. Marinoni1, G. Mathez4, A. Mazure1, B. Meneux1, R. Merighi2, S. Paltani1, R. Pello4, A. Pollo11, M. Radovich6, M. Bondi5, A. Bongiorno7, G. Busarello6, P. Ciliegi2, F. Lamareille4, Y. Mellier9, 12, P. Merluzzi6, V. Ripepi6 and D. Rizzo4

1  Laboratoire d'Astrophysique de Marseille (UMR 6110), CNRS-Université de Provence, BP 8, 13376 Marseille Cedex 12, France
    e-mail: Olivier.Ilbert@oamp.fr
2  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
3  INAF-IASF, via Bassini 15, 20133 Milano, Italy
4  Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (UMR 5572), CNRS-Université Paul Sabatier, 14 avenue E. Belin, 31400 Toulouse, France
5  INAF-IRA, via Gobetti 101, 40129 Bologna, Italy
6  INAF - Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
7  Università di Bologna, Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
8  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany
9  Institut d'Astrophysique de Paris (UMR 7095), 98bis boulevard Arago, 75014 Paris, France
10  European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
11  INAF - Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
12  Observatoire de Paris-LERMA, 61 avenue de l'Observatoire, 75014 Paris, France

(Received 6 September 2004 / Accepted 31 January 2005 )

We investigate the evolution of the galaxy luminosity function from the VIMOS-VLT Deep Survey (VVDS) from the present to z = 2 in five (U, B, V, R and I) rest-frame band-passes. We use the first epoch VVDS deep sample of 11 034 spectra selected at  $17.5 \leq I_{AB} \leq 24.0$, on which we apply the Algorithm for Luminosity Function (ALF), described in this paper. We observe a substantial evolution with redshift of the global luminosity functions in all bands. From z = 0.05 to z = 2, we measure a brightening of the characteristic magnitude M* included in the magnitude range 1.8-2.5, 1.7-2.4, 1.2-1.9, 1.1-1.8 and 1.0-1.6 in the U, B, V, R and I rest-frame bands, respectively. We confirm this differential evolution of the luminosity function with rest-frame wavelength from the measurement of the comoving density of bright galaxies ( $M \le M^{*}(z = 0.1)$). This density increases by a factor of around  2.6, 2.2, 1.8, 1.5, 1.5 between z=0.05 and z=1 in the U, B, V, R, I bands, respectively. We also measure a possible steepening of the faint-end slope of the luminosity functions, with $\Delta\alpha \sim -0.3$ between z=0.05 and z=1, similar in all bands.

Key words: surveys -- galaxies: evolution -- galaxies: luminosity function -- mass function -- galaxies: statistics

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© ESO 2005