---
author:
- 'M. Massardi'
- 'A. F. M. Enia'
- 'M. Negrello'
- 'C. Mancuso'
- 'A. Lapi'
- |
    \
    C. Vignali
- 'R. Gilli'
- 'S. Burkutean'
- 'L. Danese'
- 'G. De Zotti'
title: and ALMA observations of the nuclear activity in two strongly lensed star forming galaxies
---

[According to coevolutionary scenarios, nuclear activity and star formation play relevant roles in the early stages of galaxy formation. We aim at identifying them in high redshift galaxies by exploiting high-resolution and sensitivity X-ray and millimetre-wavelength data to confirm the presence or absence of star formation and nuclear activity and their relative role in shaping their SEDs and contributing to their energy budget.]{} [In the current paper we present the data, model and analysis in the X-ray and mm bands for two strongly lensed galaxies, SDP.9 (HATLAS J090740.0-004200) and SDP.11 (HATLAS J091043.1-000322) that we selected in the Herschel-ATLAS catalogues as having an excess emission in the mid-IR regime at redshift $\gtrsim1.5$, suggesting the presence of a nuclear activity in the early stages of galaxy formation. We observed both of them with ACIS-S in the X-ray regime and analyzed the high resolution mm data available in the ALMA 