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Arp220 is the nearest and prototypical ULIRG, and shows evidence of pc-scalemolecular outflows in its nuclear regions and strongly perturbed ionised gaskinematics on kpc scales. It is therefore the ideal system for investigatingoutflows and feedback phenomena in details. We investigate the feedback effectson the Arp220 ISM, deriving a detailed picture of the atomic gas in terms ofphysical and kinematic properties, with a spatial resolution never obtainedbefore (0.56", i.e. ~ 210 pc). We use optical IFS observations from VLT/MUSE-AOto obtain spatially resolved stellar and gas kinematics, for both ionised ([NII]6583) and neutral (Na ID5891,96) components; we also derive dustattenuation, electron density, ionisation conditions and hydrogen columndensity maps to characterise the ISM properties. Arp220 kinematics reveal thepresence of a disturbed, kpc-scale disk in the innermost nuclear regions, andhighly perturbed, multi-phase (neutral and ionised) gas along the minor-axis ofthe disk, which we interpret as a galactic-scale outflow emerging from theArp220 eastern nucleus. This outflow involves velocities up to ~ 1000 km/s atgalactocentric distances of ~ 5 kpc, and has a mass rate of ~ 50 Msun/yr, andkinetic and momentum power of ~ 1e43 erg/s and ~ 1e35 dyne, respectively. Theinferred energetics do not allow us to distinguish the origin of the outflows,i.e. whether they are AGN-driven or starburst-driven. We also present evidencefor enhanced star formation at the edges of - and within - the outflow, with astar formation rate SFR ~ 5 Msun/yr (i.e. ~ 2% of the total SFR). Our findingssuggest the presence of powerful winds in Arp220: they might be capable ofremoving or heating large amounts of gas from the host ("negative feedback"),but could be also responsible for triggering star formation ("positivefeedback").

MUSE view of Arp220: Kpc-scale multi-phase outflow and evidence for positive feedback