2007ApJ...659.1125M -
Astrophys. J., 659, 1125-1137 (2007/April-3)
Deep XMM-Newton and Chandra observations of Cl J1226.9+3332: a detailed X-ray mass analysis of a z = 0.89 galaxy cluster.
MAUGHAN B.J., JONES C., JONES L.R. and VAN SPEYBROECK L.
Abstract (from CDS):
Deep XMM-Newton and Chandra observations of Cl J1226.9+3332 at z=0.89 have enabled the most detailed X-ray mass analysis of any such high-redshift galaxy cluster. The XMM-Newton temperature profile of the system shows no sign of central cooling, with a hot core and a radially declining profile. A temperature map shows asymmetry with a hot region that appears to be associated with a subclump of galaxies at the cluster redshift but is not visible in the X-ray surface brightness. This is likely to be the result of a merger event in the cluster but does not appear to significantly affect the overall temperature profile. The XMM-Newton temperature profile and combined Chandra and XMM-Newton emissivity profile allowed precise measurements of the global properties of Cl J1226.9+3332. Within an overdensity radius of 500 times the critical density at z=0.89 (R500), we find kT=10.4±0.6 keV, Z=0.16±0.05 Z☉, and M=5.2+1.0–0.8x1014 M☉. We obtain profiles of the metallicity, entropy, cooling time, and gas fraction and find a high concentration parameter for the total density profile of the system. The global properties are compared with the local L-T and M-T relations, and we are able to make the first observational test of the predicted evolution of the YX-M500relation. We find that departures from these scaling relations are most likely caused by an underestimate of the total mass by ∼30% in the X-ray hydrostatic mass analysis due to the apparent recent or ongoing merger activity.
Abstract Copyright:
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Journal keyword(s):
Cosmology: Observations - Galaxies: Clusters: General - Galaxies: Clusters: Individual: Alphanumeric: Cl J1226.9+3332 - Galaxies: High-Redshift - Galaxies: Intergalactic Medium - X-Rays: Galaxies
CDS comments:
Fig. 3 : Foreground cluster = ClG J1227+3333
Simbad objects:
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