The VIMOS-VLT Deep Survey. Beyond color bimodality: the mix of galaxy populations up to z~2 - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2006

The VIMOS-VLT Deep Survey. Beyond color bimodality: the mix of galaxy populations up to z~2

P. Franzetti
  • Fonction : Auteur
M. Scodeggio
  • Fonction : Auteur
D. Maccagni
  • Fonction : Auteur
B. Garilli
D. Vergani
  • Fonction : Auteur
L. Guzzo
  • Fonction : Auteur
L. Tresse
O. Ilbert
  • Fonction : Auteur
F. Lamareille
  • Fonction : Auteur
T. Contini
O. Le Fevre
G. Zamorani
J. Brinchmann
S. Charlot
D. Bottini
  • Fonction : Auteur
J. P. Picat
  • Fonction : Auteur
R. Scaramella
  • Fonction : Auteur
G. Vettolani
  • Fonction : Auteur
A. Zanichelli
  • Fonction : Auteur
M. Arnaboldi
  • Fonction : Auteur
S. Bardelli
M. Bolzonella
  • Fonction : Auteur
A. Cappi
  • Fonction : Auteur
P. Ciliegi
  • Fonction : Auteur
Sylvie Foucaud
  • Fonction : Auteur
  • PersonId : 929166
I. Gavignaud
  • Fonction : Auteur
A. Iovino
  • Fonction : Auteur
H. J. Mccracken
  • Fonction : Auteur
B. Marano
  • Fonction : Auteur
B. Meneux
  • Fonction : Auteur
R. Merighi
  • Fonction : Auteur
S. Paltani
R. Pello
  • Fonction : Auteur
L. Pozzetti
  • Fonction : Auteur
M. Radovich
  • Fonction : Auteur
E. Zucca
O. Cucciati

Résumé

In this paper we discuss the mix of star-forming and passive galaxies up to z~2, based on the first epoch VIMOS-VLT Deep Survey (VVDS) data.In agreement with previous works we find that the galaxy rest-frame color distribution follows a bimodal distribution at z<=1, and we establish that this bimodality holds up to z~2. The details of the rest-frame color distribution depend however on redshift and on galaxy luminosity: faint galaxies are bluer than the luminous ones over the whole redshift range of our data, and galaxies become bluer as redshift increases. This blueing trend does not depend, to a first approximation, on galaxy luminosity. Using our spectroscopic dataset we can also separate galaxies based on a star-formation, estimated combining the equivalent width of the [OII] emission line and the strength of the Dn(4000) break. The comparison between this spectral classification and the rest-frame colors shows that about 35-40 % of the red objects are star forming galaxies. Hence we conclude that the red sequence cannot be used to effectively isolate a sample of purely passively evolving objects within a cosmological survey. We also find that the color-magnitude relations derived for the color and for the spectroscopically selected early-type galaxies have remarkably similar properties, with the contaminating star-forming galaxies within the red sequence objects introducing no significant offset in the rest frame colors. Therefore the average color of the red objects does not appear to be a very sensitive indicator for measuring the evolution of the early-type galaxy population.Finally, we use the multi-band VVDS photometric data and SED fitting to derive multi-color galaxy types, which have a slightly higher efficiency than rest-frame color in isolating the passive, non star-forming galaxies within the VVDS sample.

Dates et versions

hal-00124553 , version 1 (15-01-2007)

Identifiants

Citer

P. Franzetti, M. Scodeggio, D. Maccagni, B. Garilli, D. Vergani, et al.. The VIMOS-VLT Deep Survey. Beyond color bimodality: the mix of galaxy populations up to z~2. 2006. ⟨hal-00124553⟩
34 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More