2011A&A...526A.133G

Query : 2011A&A...526A.133G

2011A&A...526A.133G - Astronomy and Astrophysics, volume 526A, 133-133 (2011/2-1)

A mature cluster with X-ray emission at z = 2.07.

GOBAT R., DADDI E., ONODERA M., FINOGUENOV A., RENZINI A., ARIMOTO N., BOUWENS R., BRUSA M., CHARY R.-R., CIMATTI A., DICKINSON M., KONG X. and MIGNOLI M.

Abstract (from CDS):

We report evidence of a fully established galaxy cluster at z=2.07, consisting of a ∼20σ overdensity of red, compact spheroidal galaxies spatially coinciding with extended X-ray emission detected with XMM-Newton. We use VLT VIMOS and FORS2 spectra and deep Subaru, VLT and Spitzer imaging to estimate the redshift of the structure from a prominent z=2.07 spectroscopic redshift spike of emission-line galaxies, concordant with the accurate 12-band photometric redshifts of the red galaxies. Using NICMOS and Keck AO observations, we find that the red galaxies have elliptical morphologies and compact cores. While they do not form a tight red sequence, their colours are consistent with that of a γ1.3Gyr population observed at z∼2.1. From an X-ray luminosity of 7.2x1043erg/s and the stellar mass content of the red galaxy population, we estimate a halo mass of 5.3-8x1013M☉, comparable to the nearby Virgo cluster. These properties imply that this structure could be the most distant, mature cluster known to date and that X-ray luminous, elliptical-dominated clusters are already forming at substantially earlier epochs than previously known.

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Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: CL J1449-0856 (read: ClG J1449+0856) - galaxies: high-redshift - large-scale structure of Universe

Nomenclature: ClG J1449+0856 N=1. Table 2: [GDO2011] NNNN N=16 among (Nos 4489-5262).

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 JKCS 41 ClG 02 26 44.0 -04 41 36           ~ 52 0
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1339 1
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2972 0
4 MRC 1138-262 AGN 11 40 48.91 -26 29 08.9     22.00     ~ 293 1
5 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6637 0
6 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4796 2
7 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 58 0
8 [GDO2011] 5225 G 14 49 13.4445 +08 56 34.605           ~ 2 0
9 [GDO2011] 4970 G 14 49 13.970 +08 56 25.20           ~ 1 0
10 [GSD2013b] 661 G 14 49 14.0958 +08 56 31.011           ~ 3 0
11 [GDO2011] 5018 G 14 49 14.100 +08 56 25.50           ~ 1 0
12 [GDO2011] 5125 G 14 49 14.1036 +08 56 27.473           ~ 2 0
13 [GDO2011] 5080 G 14 49 14.110 +08 56 26.30           ~ 1 0
14 [GDO2011] 5138 G 14 49 14.1819 +08 56 26.435           ~ 2 0
15 [GDO2011] 4942 G 14 49 14.2256 +08 56 22.085           ~ 2 0
16 [GDO2011] 4608 G 14 49 14.330 +08 56 12.87           ~ 1 0
17 [GDO2011] 4774 G 14 49 14.4096 +08 56 15.994           ~ 2 0
18 [GDO2011] 5113 G 14 49 14.4943 +08 56 23.157           ~ 4 0
19 [GDO2011] 4948 G 14 49 14.5608 +08 56 20.758           ~ 2 0
20 [GDO2011] 4518 G 14 49 14.600 +08 56 08.75           ~ 1 0
21 [GDO2011] 4954 G 14 49 14.870 +08 56 18.14           ~ 1 0
22 [GDO2011] 4489 G 14 49 14.990 +08 56 05.06           ~ 1 0
23 [GDO2011] 5045 G 14 49 15.130 +08 56 17.63           ~ 1 0

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