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We present a panchromatic study of 11 (sub-)millimetre selected DSFGs withspectroscopically confirmed redshift ($1.5< z_{\rm spec}<3$) in the GOODS-Sfield, with the aim of constraining their astrophysical properties (e.g., age,stellar mass, dust and gas content) and characterizing their role in thecontext of galaxy evolution. The multi-wavelength coverage of GOODS-S, fromX-rays to radio band, allow us to model galaxy SED by using CIGALE with a novelapproach, based on a physical motivated modelling of stellar light attenuationby dust. Median stellar mass ($\simeq6.5\times10^{10}$ M$_\odot$) and SFR($\simeq241$ M$_\odot$ yr$^{-1}$) are consistent with galaxy main-sequence at$z\sim2$. The galaxies are experiencing an intense and dusty burst of starformation (median L$_{\rm IR}\simeq2\times10^{12}$ L$_\odot$), with a medianage of $750$ Myr. The high median content of interstellar dust (M$_{\rmdust}\simeq5\times10^8$ M$_\odot$) suggests a rapid enrichment of the ISM (ontimescales $\sim10^8$ yr). We derived galaxy total and molecular gas contentfrom CO spectroscopy and/or Rayleigh-Jeans dust continuum ($10^{10}\lesssim$M$_{\rm gas}/$M$_\odot\lesssim10^{11}$), depleted over a typical timescale$\tau_{\rm depl}\sim200$ Myr. X-ray and radio luminosities suggest that most ofthe galaxies hosts an accreting radio silent/quiet SMBH. This evidence, alongwith their compact multi-wavelength sizes (median r$_{\rm ALMA}\sim$ r$_{\rmVLA}=1.8$ kpc, r$_{\rm HST}=2.3$ kpc) measured from high-resolution imaging($\theta_{\rm res}\lesssim$ 1 arcsec), indicates these objects as the high-zstar-forming counterparts of massive quiescent galaxies, as predicted e.g., bythe in-situ scenario. Four objects show some signatures of aforthcoming/ongoing AGN feedback, that is thought to trigger the morphologicaltransition from star-forming disks to ETGs.

Unveiling the nature of 11 dusty star-forming galaxies at the peak of cosmic star formation history