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We present new data for four candidate obscured Compton-Thick (CT) quasars atz $\sim$1-2.5 observed with SINFONI VLT spectrograph in AO mode. These sourceswere selected from a 24$\mu$m Spitzer MIPS survey of the COSMOS field, on thebasis of red mid-infrared-to-optical and optical-to-near-infrared colours, withthe intention of identifying active galactic nuclei (AGNs) in dust enshroudedenvironments, where most of the black hole mass is assembled in dust enshroudedenvironments. Near infrared spectra were analyzed in order to check foremission line features and to search for broad components in the[OIII]-H$\beta$ and H$\alpha$-[NII] regions. X-ray spectral analysis, radio andMIR diagnostics, and SED fitting have also been employed to study the nature ofthe sources. We successfully identified three objects for which we had only aphotometric redshift estimate. Based on their emission line diagnostics and onancillary multi-wavelength constraints, we find that all four targets harborobscured AGNs. Broad profiles that could be attributed to the effects ofoutflows are revealed in only one target, MIRO20581. In particular, we clearlyresolved a fast ($\sim$1600 km/s) and extended ($\sim$5 kpc) outflow in the[OIII]5007 emission line. This feature, the commonly used indicator for ionisedoutflowing gas, was sampled and detected only for this target; hence, we cannot exclude the presence of outflows in the other sources. Overall, theconstraints we obtain from our targets and from other comparative samples fromthe literature suggest that these optically faint luminous infrared galaxies,hosting obscured AGNs, may represent a brief evolutionary phase between thepost-merger starburst and the unobscured QSO phases.

SINFONI spectra of heavily obscured AGNs in COSMOS: evidence of outflows in a MIR/O target at z$\sim2.5$