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Multi-wavelength study of XMMU J2235.3-2557: the most massive galaxy cluster at z > 1 | | P. Rosati
; P. Tozzi
; R. Gobat
; J.S. Santos
; M. Nonino
; R. Demarco
; C. Lidman
; C.R. Mullis
; V. Strazzullo
; H.Bohringer
; R. Fassbender
; K. Dawson
; M. Tanaka
; J. Jee
; H. Ford
; G. Lamer
; A. Schwope
; | | Date: |
9 Oct 2009 | | Abstract: | XMMU J2235.3-2557 is one of the most distant X-ray selected clusters,
spectroscopically confirmed at z=1.39. We characterize the galaxy populations
of passive members, the thermodynamical properties of the hot gas, its metal
abundance and the total mass of the system using imaging data with HST/ACS
(i775 and z850 bands) and VLT/ISAAC (J and K_s bands), extensive spectroscopic
data obtained with VLT/FORS2, and deep Chandra observations. Out of a total
sample of 34 spectroscopically confirmed cluster members, we select 16 passive
galaxies within the central 2’ (or 1 Mpc) with ACS coverage, and infer star
formation histories for a sub-sample in the core and one in the outskirts, by
modeling their spectro-photometric data with spectral synthesis models, finding
a strong mean age radial gradient. Chandra data show a regular elongated
morphology, closely resembling the distribution of core galaxies, with a
significant cool core. We measure a global X-ray temperature of
kT=8.6(-1.2,+1.3) keV (68% c.l.). By detecting the rest-frame 6.7 keV Iron K
line, we measure a metallicty Z= 0.26(+0.20,-0.16) Zsun. In the likely
hypothesis of hydrostatic equilibrium, we obtain a total mass of Mtot(<1
Mpc)=(5.9+-1.3)10^14 Msun. Overall, our analysis implies that XMM2235 is the
hottest and most massive bona-fide cluster discovered to date at z>1, with a
baryonic content, both its galaxy population and intra-cluster gas, in a
significantly advanced evolutionary stage at 1/3 of the current age of the
Universe. | | Source: | arXiv, 0910.1716 | | Services: | Forum | Review | PDF | Favorites | |
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