XMM–Newton observations of the relaxed, high‐redshift galaxy cluster ClJ0046.3+8530 at z= 0.62

A detailed analysis of XMM-Newton observations of ClJ0046.3+8530 (z = 0.624) is presented. The cluster has a moderate temperature (kT = 4.1 ± 0.3 keV) and appears to be relaxed. Emission is detected at ≥3σ significance to a radius of 88 per cent of R 200 (the radius enclosing an overdensity of 200 times the critical density at z = 0.624) in a surface brightness profile. A temperature profile (extending to 0.7R 200 ) and hardness ratio map show no significant departures from the global temperature, within the statistical limits of the data. The cluster bolometric X-ray luminosity is L X = (4.3 ± 0.3) x 10 44 erg s -1 , and the total mass derived within R 200 , assuming isothermality and hydrostatic equilibrium, is M 200 = 3.0 +0.6 -0.5 x 10 14 M ○. . The gas entropy measured at 0.1 R 200 is compared with a sample of local systems, and found to be consistent with self-similar evolution with redshift. The metallicity, gas density profile slope and gas mass fraction are all consistent with those found in low-z clusters.