  We present the ALMA view of 11 main-sequence DSFGs, (sub-)millimeter selected
in the GOODS-S field, and spectroscopically confirmed to be at the peak of
Cosmic SFH (z = 2-3). Our study combines the analysis of galaxy SED with ALMA
continuum and CO spectral emission, by using ALMA Science Archive products at
the highest spatial resolution currently available for our sample (< 1 arcsec).
We include galaxy multi-band images and photometry (in the optical, radio and
X-rays) to investigate the interlink between dusty, gaseous and stellar
components and the eventual presence of AGN. We use multi-band sizes and
morphologies to gain an insight on the processes that lead galaxy evolution,
e.g. gas condensation, star formation, AGN feedback. The 11 DSFGs are very
compact in the (sub-)millimeter (median r(ALMA) = 1.15 kpc), while the optical
emission extends tolarger radii (median r(H)/r(ALMA) = 2.05). CO lines reveal
the presence of a rotating disc of molecular gas, but we can not exclude either
the presence of interactions and/or molecular outflows. Images at higher
(spectral and spatial) resolution are needed to disentangle from the possible
scenarios. Most of the galaxies are caught in the compaction phase, when gas
cools and falls into galaxy centre, fuelling the dusty burst of star formation
and the growing nucleus. We expect these DSFGs to be the high-zstar-forming
counterparts of massive quiescent galaxies. Some features of CO emission in
three galaxies are suggestive of forthcoming/ongoing AGN feedback, that is
thought to trigger the morphological transition from star-forming disks to
ETGs.
