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There is growing evidence supporting the coeval growth of galaxies and theirresident SMBH. Most studies also claim a correlation between the activity ofthe SMBH and the star-formation of the host galaxy. It is unclear, though,whether this correlation extends to all redz and LX. In this work, we use datafrom the X-ATLAS and XMM-XXL North fields and compile the largest X-ray sampleup to date, to investigate how X-ray AGN affect the star-formation of theirhost galaxies in a wide redz and luminosity baseline, i.e., 0.03<z<3 and log LX(2-10 keV)= (41-45.5) ergs-1. Our sample consists of 3336 AGN. 1872 X-rayobjects have spectroscopic redz. For the remaining sources we calculatephotometric redz using TPZ, a machine-learning algorithm. We estimate stellarmasses (M*) and Star Formation Rates (SFRs) by applying SED fitting through theCIGALE code, using optical, near-IR and mid-IR photometry. 608 of our sourcesalso have far-IR photometry (Herschel). We use these sources to calibrate theSFR calculations of the rest of our X-ray sample. Our results show acorrelation between the LX and the SFR, at all redz and LX spanned by oursample. We also find a dependence of the specific SFR (sSFR) on redz, whilethere are indications that LX enhances the sSFR even at low redz. We thendisentangle the effects of M* and redz on the SFR and study again itsdependence on the LX. Towards this end, we use the Schreiber et al. formula toestimate the SFR of main sequence galaxies that have the same stellar mass andredshift as our X-ray AGN. Our analysis reveals that the AGN enhances thestar-formation of its host galaxy, when the galaxy lies below the main sequenceand quenches the star-formation of the galaxy it lives in, when the host liesabove the main sequence. Therefore, the effect of AGN on the SFR of the hostgalaxy, depends on the location of the galaxy relative to the main sequence.

Disentangling the AGN and Star-Formation connection using XMM-Newton