The Vimos VLT deep survey: compact structures in the CDFS
C. Adami
(1)
,
A. Mazure
(1)
,
Olivier Ilbert
(1, 2)
,
A. Cappi
(2)
,
D. Bottini
(3)
,
Bianca Garilli
(3)
,
V. Le Brun
(1)
,
Olivier Le Fèvre
(1)
,
D. Maccagni
(3)
,
J.-P. Picat
(4)
,
R. Scaramella
(5)
,
Marco Scodeggio
(3)
,
Laurence Tresse
(1)
,
G. Vettolani
(5)
,
A. Zanichelli
(5)
,
M. Arnaboldi
(6)
,
S. Arnouts
(1)
,
Sandro Bardelli
(2)
,
M. Bolzonella
(7)
,
Stéphane Charlot
(8, 9)
,
Paolo Ciliegi
(2)
,
Thierry Contini
(4)
,
Giovanni Covone
(1)
,
S. Foucaud
(3)
,
P. Franzetti
(3)
,
I. Gavignaud
(4, 10)
,
L. Guzzo
(11)
,
Angela Iovino
(11)
,
S. Lauger
(1)
,
Henry J. Mccracken
(9, 12)
,
B. Marano
(7)
,
Christian Marinoni
(1)
,
Baptiste Meneux
(1)
,
R. Merighi
(2)
,
S. Paltani
(1)
,
R. Pello
(4)
,
Agnieszka Pollo
(11)
,
L. Pozzetti
(2)
,
M. Radovich
(6)
,
G. Zamorani
(2)
,
E. Zucca
(2)
,
M. Bondi
(5)
,
Angela Bongiorno
(7)
,
G. Busarello
(6)
,
L. Gregorini
(5)
,
G. Mathez
(4)
,
Yannick Mellier
(9, 12)
,
P. Merluzzi
(6)
,
V. Ripepi
(6)
,
D. Rizzo
(4)
1
LAM -
Laboratoire d'Astrophysique de Marseille
2 OABO - INAF-Osservatorio Astronomico di Bologna
3 IASF-Milano - Istituto di Astrofisica Spaziale e Fisica Cosmica
4 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
5 IRA-INAF, Bologna
6 INAF-OAC - INAF-Osservatorio Astronomico di Capodimonte
7 UNIBO - Alma Mater Studiorum Università di Bologna = University of Bologna
8 MPA - Max-Planck-Institut für Astrophysik
9 IAP - Institut d'Astrophysique de Paris
10 ESO - European Southern Observatory
11 INAF-Osservatorio Astronomico di Brera
12 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
2 OABO - INAF-Osservatorio Astronomico di Bologna
3 IASF-Milano - Istituto di Astrofisica Spaziale e Fisica Cosmica
4 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
5 IRA-INAF, Bologna
6 INAF-OAC - INAF-Osservatorio Astronomico di Capodimonte
7 UNIBO - Alma Mater Studiorum Università di Bologna = University of Bologna
8 MPA - Max-Planck-Institut für Astrophysik
9 IAP - Institut d'Astrophysique de Paris
10 ESO - European Southern Observatory
11 INAF-Osservatorio Astronomico di Brera
12 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
Résumé
We used the Vimos VLT Deep Survey in combination with other spectroscopic, photometric, and X-ray surveys from the literature to detect several galaxy structures in the Chandra Deep Field South (CDFS). Both a friend-of-friend-based algorithm applied to the spectroscopic redshift catalog and an adaptative kernel galaxy density and color maps correlated with photometric redshift estimates were used. We mainly detected a chain-like structure at z=0.66 and two massive groups at z=0.735 and 1.098 showing signs of ongoing collapse. We also detected two galaxy walls at z=0.66 and at z=0.735 (extremely compact in redshift space). The first one contains the chain-like structure and the last one contains one of the two massive groups in its center. Finally, other galaxy structures that are probably loose low mass groups were detected. We compared the group galaxy population with simulations in order to assess the richness of these structures and studied their galaxy morphological contents. The higher redshift structures appear to probably have lower velocity dispersion than the nearby ones. The number of moderately massive structures we detected is consistent with what is expected for an LCDM model, but a larger sample is required to put significant cosmological constraints.
Domaines
Astrophysique [astro-ph]
Origine : Fichiers éditeurs autorisés sur une archive ouverte