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• W2964265740 abstract "The physical state of the gas in the central 500 pc of NGC 5128 (the radio galaxy Centaurus A), was investigated using the fine-structure lines of carbon [CI], [CII]; oxygen [OI], [OIII], and nitrogen [NII], [NIII] as well as the 12 CO(4−3) molecular line. The circumnuclear disk (CND) is traced by emission from dust and the neutral gas ([CI] and 12 CO). A gas outflow with a line-of-sight velocity of 60 km s-1 is evident in both lines. The [CI] emission from the CND is unusually strong with respect to that from CO. The center of the CND (R 63 μ m emission dominates that of [CII] even though it is absorbed with optical depths τ = 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 in the center. Ionized gas densities are highest in the CND (about 100 cm-3 ) and low everywhere else. Neutral gas densities range from 4000 cm-3 (outflow, extended thin disk ETD) to 20 000 cm-3 (CND). The CND radiation field (G o ≈ 4) is weak compared to the ETD starburst field (G o ≈ 40). The outflow has a much stronger radiation field (G o = 130). The total mass of all the CND gas is 9.1 ± 0.9×107 M ⊙ but the mass of the outflowing gas is only 15−30% of that. The outflow most likely originates from the shock-dominated CND cavity surrounding the central black hole. With a factor of three uncertainty, the mass outflow rate is ≈ 2 M ⊙ yr-1 , a thousand times higher than the accretion rate of the black hole. Without replenishment, the CND will be depleted in 15−120 million years. However, the outflow velocity is well below the escape velocity." @default.
• W2964265740 created "2019-07-30" @default.
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• W2964265740 date "2017-03-01" @default.
• W2964265740 modified "2023-09-23" @default.
• W2964265740 title "The outflow of gas from the Centaurus A circumnuclear disk - Atomic spectral line maps from Herschel/PACS and APEX" @default.
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