The zCOSMOS Survey. The dependence of clustering on luminosity and stellar mass at z=0.2-1 - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2009

The zCOSMOS Survey. The dependence of clustering on luminosity and stellar mass at z=0.2-1

S. de La Torre
C. Porciani
  • Fonction : Auteur
G. Zamorani
U. Abbas
  • Fonction : Auteur
B. Garilli
E. Zucca
S. Lilly
  • Fonction : Auteur
O. Le Fevre
T. Contini
V. Mainieri
  • Fonction : Auteur
A. Renzini
  • Fonction : Auteur
M. Scodeggio
  • Fonction : Auteur
S. Bardelli
K. Caputi
  • Fonction : Auteur
G. Coppa
  • Fonction : Auteur
O. Cucciati
L. de Ravel
  • Fonction : Auteur
P. Franzetti
  • Fonction : Auteur
P. Kampczyk
  • Fonction : Auteur
C. Knobel
  • Fonction : Auteur
K. Kovac
  • Fonction : Auteur
C. Maier
  • Fonction : Auteur
E. Ricciardelli
  • Fonction : Auteur
L. Tresse
D. Vergani
  • Fonction : Auteur
D. Bottini
  • Fonction : Auteur
Alessandro Cimatti
  • Fonction : Auteur
P. Cassata
  • Fonction : Auteur
M. Fumana
  • Fonction : Auteur
D. Maccagni
  • Fonction : Auteur
P. Oesch

Résumé

We study the dependence of galaxy clustering on luminosity and stellar mass at redshifts z ~ [0.2-1] using the first zCOSMOS 10K sample. We measure the redshift-space correlation functions xi(rp,pi) and its projection wp(rp) for sub-samples covering different luminosity, mass and redshift ranges. We quantify in detail the observational selection biases and we check our covariance and error estimate techniques using ensembles of semi-analytic mock catalogues. We finally compare our measurements to the cosmological model predictions from the mock surveys. At odds with other measurements, we find a weak dependence of galaxy clustering on luminosity in all redshift bins explored. A mild dependence on stellar mass is instead observed. At z~0.7, wp(rp) shows strong excess power on large scales. We interpret this as produced by large-scale structure dominating the survey volume and extending preferentially in direction perpendicular to the line-of-sight. We do not see any significant evolution with redshift of the amplitude of clustering for bright and/or massive galaxies. The clustering measured in the zCOSMOS data at 0.5=10 is only marginally consistent with predictions from the mock surveys. On scales larger than ~2 h^-1 Mpc, the observed clustering amplitude is compatible only with ~1% of the mocks. Thus, if the power spectrum of matter is LCDM with standard normalization and the bias has no unnatural scale-dependence, this result indicates that COSMOS has picked up a particularly rare, ~2-3 sigma positive fluctuation in a volume of ~10^6 h^-1 Mpc^3. These findings underline the need for larger surveys of the z~1 Universe to appropriately characterize the level of structure at this epoch.

Dates et versions

hal-00402201 , version 1 (07-07-2009)

Identifiants

Citer

B. Meneux, L. Guzzo, S. de La Torre, C. Porciani, G. Zamorani, et al.. The zCOSMOS Survey. The dependence of clustering on luminosity and stellar mass at z=0.2-1. Astronomy and Astrophysics - A&A, 2009, 505 (2), pp.463-482. ⟨10.1051/0004-6361/200912314⟩. ⟨hal-00402201⟩
456 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More