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We aim at probing the emission mechanism of the accreting super massive blackholes in the high redshift Universe. We study the X-ray spectrum ofULAS1120+0641, the highest redshift quasar detected so far at z=7.085, whichhas been deeply observed (340 ks) by XMM-Newton. Despite the long integrationtime the spectral analysis is limited by the poor statistics, with only 150source counts being detected. We measured the spectrum in the 2-80 keVrest-frame (0.3-10 keV observed) energy band. Assuming a simple power law modelwe find a photon index of 2.0+/-0.3 and a luminosity of 6.7+/-0.3 10^44 erg/sin the 2-10 keV band, while the intrinsic absorbing column can be only looselyconstrained (NH< 1E23 cm^-2). Combining our data with published data wecalculate that the X-ray-to-optical spectral index alpha_OX is1.8+/-0.1, inagreement with the alpha_OX-UV luminosity correlation valid for lower redshiftquasars. We expanded to high energies the coverage of the spectral energydistribution of ULAS1120+0641. This is the second time that a z >6 quasar hasbeen investigated through a deep X-ray observation. In agreement with previousstudies of z~6 AGN samples, we do not find any hint of evolution in thebroadband energy distribution. Indeed from our dataset ULAS 1120+0641 isindistinguishable from the population of optically bright quasar at lowerredshift.

X-ray observation of ULAS J1120+0641, the most distant quasar at z=7.08