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We report a tentative correlation between the outflow characteristics derivedfrom OH absorption at $119\,\mu\text{m}$ and [CII] emission at$158\,\mu\text{m}$ in a sample of 22 local and bright ultraluminous infraredgalaxies (ULIRGs). For this sample we investigate whether [CII] broad wings area good tracer of molecular outflows, and how the two tracers are connected.Fourteen objects in our sample have a broad wing component as traced by [CII],and all of these also show OH119 absorption indicative of an outflow (in 1 casean inflow). The other eight cases, where no broad [CII] component was found,are predominantly objects with no OH outflow or a low-velocity ($\leq100\,\text{km s}^{-1}$) OH outflow. The full width at half maximum (FWHM) ofthe broad [CII] component shows a trend with the OH119 blue-shifted velocity,although with significant scatter. Moreover, and despite large uncertainties,the outflow masses derived from OH and broad [CII] show a 1:1 relation. Themain conclusion is therefore that broad [CII] wings can be used to tracemolecular outflows. This may be particularly relevant at high redshift, wherethe usual tracers of molecular gas (like low-J CO lines) become hard toobserve. Additionally, observations of blue-shifted Na I D $\lambda\lambda5890,5896$ absorption are available for ten of our sources. Outflow velocitiesof Na I D show a trend with OH velocity and broad [CII] FWHM. Theseobservations suggest that the atomic and molecular gas phases of the outfloware connected.

Broad [CII] line wings as tracer of molecular and multi-phase outflows in infrared bright galaxies