The VIMOS-VLT Deep Survey: Galaxy luminosity function per morphological type up to z = 1.2

O. Ilbert, S. Lauger, L. Tresse, V. Buat, S. Arnouts, O. Le Fèvre, D. Burgarella, E. Zucca, S. Bardelli, G. Zamorani, D. Bottini, B. Garilli, V. Le Brun, D. Maccagni, J. P. Picat, R. Scaramella, M. Scodeggio, G. Vettolani, A. Zanichelli, C. AdamiM. Amaboldi, M. Bolzonella, A. Cappi, S. Charlot, T. Contini, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, A. Iovino, H. J. McCracken, B. Marano, C. Marinoni, G. Mathez, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pello, A. Polio, L. Pozzetti, M. Radovich, M. Bondi, A. Bongiorno, G. Busarello, P. Ciliegi, Y. Mellier, P. Merluzzi, V. Ripepi, D. Rizzo

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66 Citas (Scopus)

Resumen

Aims. We have computed the evolution of the rest-frame B-band luminosity function (LF) for bulge and disk-dominated galaxies since z = 1.2. Methods. We use a sample of 605 spectroscopic redshifts with IAB ≤24 in the Chandra Deep Field South from the VIMOS-VLT Deep Survey, 3555 galaxies with photometric redshifts from the COMBO-17 multi-color data, coupled with multi-color HST/ACS images from the Great Observatories Origin Deep Survey. We split the sample in bulge- and disk-dominated populations on the basis of asymmetry and concentration parameters measured in the rest-frame B-band. Results. We find that at z = 0.4-0.8, the LF slope is significantly steeper for the disk-dominated population (α = -1.19 ±0.07) compared to the bulge-dominated population (α = -0.53 ±0.13). The LF of the bulge-dominated population is composed of two distinct populations separated in rest-frame color: 68% of red (B - 1)AB > 0.9 and bright galaxies showing a strongly decreasing LF slope α = +0.55 ± 0.21, and 32% of blue (B - 1)AB < 0.9 and more compact galaxies which populate the LF faint-end. We observe that red bulge-dominated galaxies are already well in place at z - 1, but the volume density of this population is increasing by a factor 2.7 between z - 1 and z - 0.6. It may be related to the building-up of massive elliptical galaxies in the hierarchical scenario. In addition, we observe that the blue bulge-dominated population is dimming by 0.7 mag between z - 1 and z - 0.6. Galaxies in this faint and more compact population could possibly be the progenitors of the local dwarf spheroidal galaxies.

Idioma originalInglés
Páginas (desde-hasta)809-815
Número de páginas7
PublicaciónAstronomy and Astrophysics
Volumen453
N.º3
DOI
EstadoPublicada - jul. 2006

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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