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Theoretical models of galaxy-AGN co-evolution ascribe an important role forthe feedback process to a short, luminous, obscured, and dust-enshrouded phaseduring which the accretion rate of the SMBH is expected to be at its maximumand the associated AGN-driven winds are also predicted to be maximallydeveloped. To test this scenario, we have isolated a text-book candidate fromthe eROSITA Final Equatorial-Depth Survey (eFEDS) obtained within thePerformance and Verification program of the eROSITA telescope on board SpectrumRoentgen Gamma. From an initial catalog of 246 hard X-ray selected sourcesmatched with the photometric and spectroscopic information available within theeROSITA and Hyper Suprime-Cam consortia, three candidates Quasars in thefeedback phase have been isolated applying the diagnostic proposed in Brusa etal. (2015). Only one source (eFEDSU J091157.5+014327) has a spectrum alreadyavailable (from SDSS-DR16, z=0.603) and it unambiguously shows the presence ofa broad component (FWHM~1650 km/s) in the [OIII]5007 line. The associatedobserved L_[OIII] is ~2.6x10^{42} erg/s, one to two orders of magnitude largerthan that observed in local Seyferts and comparable to those observed in asample of z~0.5 Type 1 Quasars. From the multiwavelength data available wederive an Eddington Ratio (L_bol/L_Edd) of ~0.25, and a bolometric correctionin the hard X-ray of k_bol~10, lower than those observed for objects at similarbolometric luminosity. The presence of an outflow, the high X-ray luminosityand moderate X-ray obscuration (L_X~10^44.8 erg/s, N_H~2.7x10^22 cm^-2) and thered optical color, all match the prediction of quasars in the feedback phasefrom merger driven models. Forecasting to the full eROSITA all-sky survey withits spectroscopic follow-up, we predict that by the end of 2024 we will have asample of few hundreds such objects at z=0.5-2.

The eROSITA Final Equatorial-Depth Survey (eFEDS): The first archetypal Quasar in the feedback phase discovered by eROSITA