SIMBAD references

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.

Abstract Copyright:

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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2022.11.30-09:15:59

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