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- W2336878265 abstract "We report a tentative correlation between the outflow characteristics derived from OH absorption at $119,mutext{m}$ and [CII] emission at $158,mutext{m}$ in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this sample we investigate whether [CII] broad wings are a 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 case an inflow). The other eight cases, where no broad [CII] component was found, are predominantly objects with no OH outflow or a low-velocity ($leq 100,text{km s}^{-1}$) OH outflow. The full width at half maximum (FWHM) of the 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. The main conclusion is therefore that broad [CII] wings can be used to trace molecular outflows. This may be particularly relevant at high redshift, where the usual tracers of molecular gas (like low-J CO lines) become hard to observe. Additionally, observations of blue-shifted Na I D $lambdalambda 5890,5896$ absorption are available for ten of our sources. Outflow velocities of Na I D show a trend with OH velocity and broad [CII] FWHM. These observations suggest that the atomic and molecular gas phases of the outflow are connected." @default.
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- W2336878265 date "2016-04-01" @default.
- W2336878265 modified "2023-09-26" @default.
- W2336878265 title "Broad [CII] line wings as tracer of molecular and multi-phase outflows in infrared bright galaxies" @default.
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- W2336878265 hasPublicationYear "2016" @default.
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