Brusa, M.M.BrusaCRESCI, GIOVANNIGIOVANNICRESCIE. DaddiPaladino, RositaRositaPaladinoM. PernaBONGIORNO, ANGELAANGELABONGIORNOE. LussoM. T. SargentCASASOLA, VIVIANAVIVIANACASASOLAFeruglio, ChiaraChiaraFeruglioF. FraternaliI. GeorgievV. MainieriS. CarnianiCOMASTRI, AndreaAndreaCOMASTRIF. DurasF. FioreMANNUCCI, FILIPPOFILIPPOMANNUCCIMarconi, AlessandroAlessandroMarconiPICONCELLI, EnricoEnricoPICONCELLIG. ZamoraniGILLI, RobertoRobertoGILLIF. La FrancaLANZUISI, GiorgioGiorgioLANZUISID. LutzSANTINI, PaolaPaolaSANTININ. Z. ScovilleC. VignaliF. VitoS. RabienBUSONI, LORENZOLORENZOBUSONIBONAGLIA, MARCOMARCOBONAGLIA2021-01-082021-01-0820180004-6361http://hdl.handle.net/20.500.12386/29604We imaged with ALMA and ARGOS/LUCI the molecular gas and the dust and stellar continuum in XID2028, an obscured QSO at z=1.593, where the presence of a massive outflow in the ionized gas component traced by the [O III]5007 emission has been resolved up to 10 kpc. This target represents a unique test case to study QSO 'feedback in action' at the peak epoch of AGN-galaxy coevolution. The QSO has been detected in the CO(5-4) transition and in the 1.3mm continuum, at ~30 and ~20 {\sigma} significance respectively, with both emissions confined in the central (<4 kpc) radius area. Our analysis suggests the presence of a fast rotating molecular disc (v~400 km/s) on very compact scales, and well inside the galaxy extent seen in the rest-frame optical light (~10 kpc, as inferred from the LUCI data). Adding available measurements in additional two CO transitions, CO(2-1) and CO(3-2), we could derive a total gas mass of ~10$^{10}$ M$_\odot$, thanks to a critical assessment of CO excitation and the comparison with Rayleigh-Jeans continuum estimate. This translates into a very low gas fraction (<5%) and depletion time scales of 40-75 Myr, reinforcing the result of atypical gas consumption conditions in XID2028, possibly due to feedback effects on the host galaxy. Finally, we also detect at ~5{\sigma} the presence of high velocity CO gas, which we interpret as a signature of galaxy-scale molecular outflow, spatially coincident with the ionised gas outflow. XID2028 represents therefore a unique case where the measurement of total outflowing mass (~500-800 M$_\odot$/yr) including the molecular and atomic components, in both the ionised and neutral phases, has been attempted for a high-z QSO.STAMPAenArticle10.1051/0004-6361/2017316412-s2.0-85054979419000430140600002https://www.aanda.org/articles/aa/full_html/2018/04/aa31641-17/aa31641-17.html2018A&A...612A..29BFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems