Passive galaxies as tracers of cluster environments at $\it z$ ~ 2 - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2015

Passive galaxies as tracers of cluster environments at $\it z$ ~ 2

(1, 2) , (1) , (1) , (3) , (4) , (1) , (5) , (6) , (7) , (8) , (9) , (10) , (5) , (11) , (1) , (11) , (3) , (12) , (7) , (4) , (4)
1
2
3
4
5
6
7
8
9
10
11
12
Emanuele Daddi
  • Function : Author
  • PersonId : 837613
B. Garilli
N. Arimoto
  • Function : Author
D. Maccagni
  • Function : Author
G. Zamorani

Abstract

Even 10 billion years ago, the cores of the first galaxy clusters are often found to host a characteristic population of massive galaxies with already suppressed star formation. Here we search for distant cluster candidates at $\it z$~ 2 using massive passive galaxies as tracers. With a sample of ~40 spectroscopically confirmed passive galaxies at 1.3 < $\it z$ < 2.1, we tuned photometric redshifts of several thousand passive sources in the 2 sq. deg COSMOS field. This allowed us to map their density in redshift slices, probing the large-scale structure in the COSMOS field as traced by passive sources. We report here on the three strongest passive galaxy overdensities that we identify in the range 1.5 <$\it z$< 2.5. While the actual nature of these concentrations still needs to be confirmed, we discuss their identification procedure and the arguments supporting them as candidate galaxy clusters (probably in the mid-10$^{1{3}}$M⊙ range). Although this search approach is probably biased toward more evolved structures, it has the potential of selecting still rare, cluster-like environments close to their epoch of first appearance, enabling new investigations of the evolution of galaxies in the context of structure growth.
Fichier principal
Vignette du fichier
aa25038-14.pdf (464.97 Ko) Télécharger le fichier
Origin : Publication funded by an institution

Dates and versions

cea-01300539 , version 1 (11-04-2016)

Identifiers

Cite

V. Strazzullo, Emanuele Daddi, R. Gobat, B. Garilli, M. Mignoli, et al.. Passive galaxies as tracers of cluster environments at $\it z$ ~ 2. Astronomy and Astrophysics - A&A, 2015, 576, pp.L6. ⟨10.1051/0004-6361/201425038⟩. ⟨cea-01300539⟩
535 View
86 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More