Science Archive for SDP9, and, by combining the information available in mm, optical and X-ray bands we reconstructed the source morphology.]{}

Both the targets were detected in the X-ray, strongly indicating the presence of highly obscured nuclear activity.

ALMA observations for SDP9 for continuum and CO(6-5) spectral line with high resolution (0.02arcsec corresponding to $\sim65$ pc at galaxy distance) allowed us to estimate the lensed galaxy redshift to a better accuracy than pre-ALMA estimates (1.5753$\pm0.0003$) and to model the emission of the optical, millimetric, and X-ray band emission for this galaxy. We demonstrated that the X-ray emission is generated in the nuclear environment and it strongly support the presence of nuclear activity in this object. On the basis of the X-ray data, we attempted an estimate of the BH properties in these galaxies.

[By taking advantage of the lensing magnification we identified weak nuclear activity associated with high-$z$ galaxies with large star formation rates, useful to extend the investigation of the relationship between star formation and nuclear activity to two intrinsically less luminous, high-$z$ star forming galaxies than was possible so far. Given our results only for two objects, they solely cannot constrain the evolutionary models, but provide us with 