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The physical state of the gas in the central 500 pc of NGC~5128 (the radiogalaxy Centaurus A - Cen A), was investigated using the far-infraredfine-structure lines of carbon, oxygen, and nitrogen, as well as the CO(4-3)molecular line. The circumnuclear disk (CND) is traced by emission from dustand the neutral gas ([CI] and CO). A gas outflow with a line-of-sight velocityof 60 km/s is evident in both species. The center of the CND is bright in [OI],[OIII], and [CII]; [OI]63mu emission dominates that of [CII] even though it isabsorbed with optical depths of 1.0-1.5. The outflow is well-traced by the[NII] and [NIII] lines and also seen in the [CII] and [OIII] lines that peak inthe center. Ionized gas densities are moderate in the CND and low everywhereelse. Neutral gas densities range from 4000 per cm3 (outflow, extended thindisk ETD) to 20 000 per cm3 (CND). The CND radiation field is weak compared tothe ETD starburst field. The outflow has a much stronger radiation field. Thetotal mass of all the CND gas is 9 x 10^(7) M(o) and the mass of the outflowinggas is only 15%-30% of that. The outflow most likely originates from theshock-dominated CND cavity surrounding the central black hole. With a factor ofthree uncertainty, the mass outflow rate is about 2 M(o)/yr, a thousand timeshigher than the accretion rate of the black hole. Without replenishment, theCND will be depleted in 15-120 million years. However, the outflow velocity iswell below the escape velocity.

The outflow of gas from the Centaurus A circumnuclear disk: atomic spectral line maps from Herschel-PACS and APEX