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We create a complete gravity torque map of the disk of the LINER/Seyfert 1.9galaxy NGC4579. We quantify the efficiency of angular momentum transport andsearch for signatures of secular evolution in the fueling process from r~15kpcdown to the inner r~50pc around the Active Galactic Nucleus (AGN). We use boththe 1-0 and 2-1 line maps of CO obtained with the Plateau de BureInterferometer (PdBI) as part of the NUclei of Galaxies-(NUGA)-project. Wederive the stellar potential from a NIR (K band) wide field image of thegalaxy. The K-band image, which reveals a stellar bar, together with a highresolution HI map of NGC4579 obtained with the Very Large Array (VLA), allow usto extend the gravity torque analysis to the outer disk. The bulk of the gasresponse traced by the CO PdBI maps follows the expected gas flow patterninduced by the bar potential in the presence of two Inner Lindblad Resonances(ILR). We also detect an oval distortion in the inner r~200pc of the K-bandimage. The oval is not aligned with the large-scale bar, a signature ofdynamical decoupling. The morphology of the outer disk suggests that theneutral gas is currently piling up in a pseudo-ring formed by two windingspiral arms that are morphologically decoupled from the bar structure. In theouter disk, the decoupling of the spiral allows the gas to efficiently producenet gas inflow on intermediate scales. The corotation barrier seems to beovercome due to secular evolution processes. The gas in the inner disk isefficiently funneled by gravity torques down to r~300pc. Closer to the AGN, thetwo m=2 modes (bar and oval) act in concert to produce net gas inflow down tor~50pc, providing a clear smoking gun evidence of fueling with associated shortdynamical time-scales.

Molecular gas in NUclei of GAlaxies (NUGA). XI. A complete gravity torque map of NGC4579: new clues on bar evolution