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In early type galaxies, externally accreted gas is thought to be the mainsource of gas replenishment at late times. We use MUSE integral fieldspectroscopy data to study the active S0 galaxy NGC 5077, known to havedisturbed dynamics, indicative of a past external interaction. We confirm thepresence of a stellar kinematically distinct core with a diameter of 2.8 kpc,counter-rotating with respect to the main stellar body of the galaxy. We findthat the counter-rotating core consists of an old stellar population, notsignificantly different from the rest of the galaxy. The ionised gas isstrongly warped and extends out to 6.5 kpc in the polar direction and in afilamentary structure. The gas dynamics is complex, with significant changes inthe position angle as a function of radius. The ionised gas line ratios areconsistent with LINER excitation by the AGN both in the nucleus and atkiloparsec scales. We discover a nuclear outflow with projected velocity V ~400 km/s, consistent with a hollow outflow cone intersecting the plan of thesky. The properties of the misaligned gas match predictions from numericalsimulations of misaligned gas infall after a gas-rich merger. The warp andchange in the gas orientation as a function of radius are consistent with gasrelaxation due to stellar torques, that are stronger at small radii where thegas aligns faster than in the outer regions, driving gas to the nucleus. Thestellar and gas dynamics indicate that NGC 5077 has had at least two externalinteractions, one that resulted in the formation of the counter-rotating corefollowed by late time external gas accretion. NGC 5077 illustrates theimportance of external interactions in the replenishment of the galaxy gasreservoir and the nuclear gas content available for black hole fuelling.

External gas accretion provides a fresh gas supply to the active S0 galaxy NGC 5077