galaxy components and the relative roles of star formation and nuclear activity in shaping their SEDs and contributing to their energy budget.

Observations established, beyond any reasonable doubt, that the growths of galaxies and super-massive black holes are intimately connected by investigating the nuclear activity in X-rays in galaxies with large SFRs mainly selected at FIR or submm wavelengths (e.g. Mullaney et al. 2012, Wang et al. 2013, Delvecchio et al. 2015) or by studying the star formation in AGN host galaxies, exploiting the follow-up at FIR and (sub)mm wavelengths of X-ray selected AGNs and of optically selected QSOs (e.g. Mullaney et al. 2012b; Page et al. 2012; Santini et al. 2012)).

With a similar approach we confirm the properties of the nuclear activity in two lensed galaxies, detected in the Herschel-ATLAS catalogues, characterized by large SFRs, by means of X-ray ACIS-S observations and exploiting high resolution mm data available in the ALMA Science Archive. With these new data we improved the models of our targets and attempted an estimate of the star formation and BH properties.

The outline of this paper is the following: in §2 we present the two targets of our study, in §3 we present the 