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2004MNRAS.351.1193M - Mon. Not. R. Astron. Soc., 351, 1193-1203 (2004/July-2)
An XMM-Newton observation of the massive, relaxed galaxy cluster ClJ1226.9+3332 at z= 0.89.
MAUGHAN B.J., JONES L.R., EBELING H. and SCHARF C.
Abstract (from CDS):
A temperature profile is constructed (for the first time at this redshift) and is consistent with the cluster being isothermal out to 45 per cent of the virial radius. Within the virial radius (corresponding to a measured overdensity of a factor of 200), a total mass of 1.4±0.5 x1015 M☉is derived, with a gas mass fraction of 12±5 per cent (for a Λ cold dark matter cosmology and H0= 70 km/s/Mpc). This total mass is similar to that of the Coma cluster. The bolometric X-ray luminosity is 5.3+0.2–0.2x 1045 erg/s. Analysis of a short Chandra observation confirms the lack of significant point-source contamination, the temperature, and the luminosity, albeit with lower precision. The probabilities of finding a cluster of this mass within the volume of the discovery X-ray survey are ∼8x10–5 for ΩM= 1 and 0.64 for ΩM= 0.3, making ΩM= 1 highly unlikely.
The entropy profile suggests that entropy evolution is being observed. The metal abundance (of Z= 0.33+0.14–0.10Z☉), gas mass fraction and gas distribution are consistent with those of local clusters; thus the bulk of the metals were in place by z= 0.89.
Abstract Copyright: 2004 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: ClJ12269+3332 - galaxies: high-redshift - intergalactic medium - cosmology: observations - X-rays: galaxies
Simbad objects: 4
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