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We present a detailed study of a X -ray selected sample of 5 submillimeterbright QSOs at $z\sim2$, where the highest rates of star formation (SF) andfurther growth of black holes (BH) occur. Therefore, this sample is a greatlaboratory to investigate the co-evolution of star formation and AGN. Wepresent here the analysis of the spectral energy distributions (SED) of the 5QSOS, including new data from Herschel PACS and SPIRE. Both AGN components(direct and reprocessed) and like Star Formation (SF) are needed to model itsSED. From the SED and their UV-optical spectra we have estimated the mass ofthe black hole ($M_{BH} = 10^9 - 10^{10} M_{SUN}$) and bolometric luminositiesof AGN ($L_{BOL} = (0.8-20) \times 10^{13} L_{SUN}$). These objects show veryhigh luminosities in the far infrared range (at the H/ULIRG levels) and veryhigh rates of SF (SFR = 400-1400 $M_{SUN}$/y). Known their current SFR andtheir BH masses, we deduce that their host galaxies must be already verymassive, or would not have time to get to the local relation between BH massand bulge. Finally, we found evidence of a possible correlation between thecolumn density of ionized gas detected in X-rays ($NH_{ion}$) and SFR, whichwould provide a link between AGN and SF processes.

Traces of co-evolution in high z X-ray selected and submm-luminous QSOs