Deep XMM-Newton and Chandra observations of ClJ1226.9 + 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 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 ClJ1226.9 + 3332 ; we find kT = 10.4 \pm 0.6 \mbox { $ \mathrm { ~ { } keV } $ } , Z = 0.16 \pm 0.05 \mathrm { Z _ { \odot } } , and M = 5.2 ^ { +1.0 } _ { -0.8 } \times 10 ^ { 14 } \mathrm { M _ { \odot } } .
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 \mathrm { L - T } and \mathrm { M - T } relations , and we are able to make the first observational test of the predicted evolution of the \mathrm { Y _ { X } - M _ { 500 } } relation .
We find that departures from these scaling relations are most likely caused by an underestimate of the total mass by \sim 30 \% in the X-ray hydrostatic mass analysis due to the apparent recent or ongoing merger activity .