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Dust-obscured galaxies are thought to represent an early evolutionary phaseof massive galaxies in which the active galactic nucleus (AGN) is still deeplyburied in significant amounts of dusty material and its emission is stronglysuppressed. The unprecedented sensitivity of the James Webb Space Telescopeenables us for the first time to detect the rest-frame optical emission ofheavily obscured AGN and unveil the properties of the hidden accretingsuper-massive black holes (BHs). In this work, we present the JWST/NIRSpec IFSdata of ALESS073.1, a massive, dusty, star-forming galaxy at $z = 4.76$ hostingan AGN at its center. The detection of a very broad $H_\alpha$ emissionassociated with the Broad Line Region (BLR) confirms the presence of a BH($\log(M_{BH}/M_\odot)>8.7$) accreting at less than 15\% of its Eddington limitand classifies the target as a Type 1 AGN. The rest-frame optical emissionlines also reveal a fast ionized gas outflow marginally resolved in the galaxycenter. The high sensitivity of NIRSpec allows us to perform the kinematicanalysis of the narrow H$\alpha$ component which indicates that the warmionized gas velocity field is consistent with disk rotation. We also find that,in the innermost nuclear regions ($< 1.5$ kpc), the intrinsic velocitydispersion of the disk reaches $\sim 150$ km/s, $\sim 2-3$ times higher thanthe velocity dispersion inferred from the [CII] 158$\mu$m line tracing mostlycold gas. Since, at large radii, the velocity dispersion of the warm and coldgas are comparable, we conclude that the outflows are injecting turbulence inthe warm ionized gas in the central region, but they are not sufficientlypowerful to disrupt the dense gas and quench star formation. These findingssupport the scenario that dust-obscured galaxies represent the evolutionarystage preceding the unobscured quasar when all gas and dust are removed fromthe host.

GA-NIFS: Early-stage feedback in a heavily obscured AGN at $z=4.76$