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We present here a study of XMM-Newton data of two distant galaxy clustercandidates. One of these was discovered serendipitously in near infrared data,CL J0533-2411, the other one corresponds to the cluster EIS J0533-2412 part ofthe EIS cluster survey. The estimated redshift of CL J0533-2411 is z=1.2-1.7.EIS J0533-2412 is a rich system (Lambda_cl=299), with a spectroscopicallyconfirmed redshift of z=1.3. Both galaxy concentrations show firm X-raydetections, located within 30" of their optical center. However, we cannotresolve the sources with XMM-Newton. If the X-ray emission originates from theX-ray emitting intra-cluster medium (ICM) it would be extremely concentratedwhich is rather unlikely (core radii below 14 h_{65}^{-1}kpc and 40h_{65}^{-1}kpc, respectively). We argue that the X-ray sources are more likelyAGN members of the galaxy concentrations. We set an upper limit for thebolometric luminosity of a hot ICM in the range ~0.7-2.1 10^{44}h_{65}^{-2}erg/s for CL J0533-2411, depending on the exact redshift. For EISJ0533-2412 the limit is L_bol=(6.2+/-1.4) 10^{43} h_{65}^{-2}erg/s. Weinterpret our result in the following way: EIS J0533-2412 (and possibly CLJ0533-2411) are proto-clusters and show matter overdensities before collapse,which explains the low significance of extended X-ray emission.Comment: Accepted for publication in A&A, 8 pages, 4 figures, figure 1  submitted as jpeg fil

The origin of X-ray emission of two distant ($\mathsf{\textit{z}\,>1}$) cluster candidates with XMM-Newton