We present a homogeneous and complete catalogue of optical galaxy groups identified in the VIMOS-VLT spectroscopic Deep Survey (VVDS). We use mock catalogues extracted from the Millennium simulation to study the potential systematics that might affect the overall distribution of the identified systems, and also to asses how well galaxy redshifts trace the line-of-sight velocity dispersion of the underlying mass overdensity. We train on these mock catalogues the adopted group-finding technique (the Voronoi-Delaunay Method, VDM), to recover in a robust and unbiased way the redshift and velocity dispersion distributions of groups and maximise the level of completeness (C) and purity (P) of the group catalogue. We identify 318(/144) VVDS groups with at least 2(/3) members within 0.2 <= z <= 1.0, globally with C=60% and P=50%. We use the group sample to study the redshift evolution of the fraction f_b of blue galaxies within 0.2 <= z <= 1 in both groups and in the whole ensemble of galaxies irrespectively of their environment.

The VIMOS-VLT deep survey: the group catalogue

CUCCIATI, OLGA;
2010

Abstract

We present a homogeneous and complete catalogue of optical galaxy groups identified in the VIMOS-VLT spectroscopic Deep Survey (VVDS). We use mock catalogues extracted from the Millennium simulation to study the potential systematics that might affect the overall distribution of the identified systems, and also to asses how well galaxy redshifts trace the line-of-sight velocity dispersion of the underlying mass overdensity. We train on these mock catalogues the adopted group-finding technique (the Voronoi-Delaunay Method, VDM), to recover in a robust and unbiased way the redshift and velocity dispersion distributions of groups and maximise the level of completeness (C) and purity (P) of the group catalogue. We identify 318(/144) VVDS groups with at least 2(/3) members within 0.2 <= z <= 1.0, globally with C=60% and P=50%. We use the group sample to study the redshift evolution of the fraction f_b of blue galaxies within 0.2 <= z <= 1 in both groups and in the whole ensemble of galaxies irrespectively of their environment.
2010
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
341
343
O. Cucciati; C. Marinoni;A. Iovino;S. Bardelli;C. Adami;A. Mazure
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/398100
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact