Smirnova-Pinchukova, I.Husemann, BBusch, GAppleton, P NBethermin, M.Combes, FCroom, Scott MDavis, Timothy A.Fischer, C.Gaspari, M.Groves, Brent2023-04-032023-04-030004-6361http://hdl.handle.net/1885/287986The [C ii]λ158 µm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [Cii] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [Cii] excess with respect to the FIR luminosity in the nearby AGN host galaxy HE 1353−1917. This galaxy is exceptional among a sample of five targets because the AGN ionization cone and radio jet directly intercept the cold galactic disk. As a consequence, a massive multiphase gas outflow on kiloparsec scales is embedded in an extended narrow-line region. Because HE 1353−1917 is distinguished by these special properties from our four bright AGN, we propose that a global [Cii] excess in AGN host galaxies could be a direct signature of a multiphase AGN-driven outflow with a high mass-loading factor.M.G. is supported by the Lyman Spitzer Jr. Fellowship (Princeton University) and by NASA Chandra GO7-18121X and GO8-19104X. M.P.T. acknowledges support from the Spanish MINECO through grant AYA2015-63939-C2-1-P.application/pdfen-AU© I. Smirnova-Pinchukova et al. 2019https://creativecommons.org/licenses/by/4.0/galaxies: Seyfertgalaxies: star formationISM: jets and outflowsinfrared: ISM201910.1051/0004-6361/2019355772022-01-16Creative Commons Attribution License