We report on a 20 ksec XMM observation of the distant cluster RX J1120.1+4318 , discovered at z = 0.6 in the SHARC survey .
The cluster has a regular spherical morphology , suggesting it is in a relaxed state .
The combined fit of the EPIC/MOS & pn camera gives a cluster mean temperature of { k } T = 5.3 \pm 0.5 ~ { } keV with an iron abundance of 0.47 \pm 0.19 .
The temperature profile , measured for the first time at such a redshift , is consistent with an isothermal atmosphere up to half the virial radius .
The surface brightness profile , measured nearly up to the virial radius , is well fitted by a \beta –model , with \beta = 0.78 ^ { +0.06 } _ { -0.04 } and a core radius of \theta _ { c } = 0.44 ^ { +0.06 } _ { -0.04 } ~ { } { arcmin } .
We compared the properties of RX J1120.1+4318 with the properties of nearby clusters for two cosmological models : an Einstein - de Sitter Universe and a flat low density Universe with \Omega _ { 0 } = 0.3 .
For both models , the scaled emission measure profile beyond the core , the gas mass fraction and luminosity are consistent with the expectations of the self-similar model of cluster formation , although a slightly better agreement is obtained for a low density Universe .
There is no evidence of a central cooling flow , in spite of the apparent relaxed state of the cluster .
This is consistent with its estimated cooling time , larger than the age of the Universe at the cluster redshift .
The entropy profile shows a flat core with a central entropy of \sim 140 ~ { } keV~ { } { cm ^ { 2 } } , remarkably similar to the entropy floor observed in nearby clusters , and a rising profile beyond typically 0.1 virial radius .
Implications of our results , in terms of non-gravitational physics in cluster formation , are discussed .