Israel, F. P., Guesten, R., Meijerink, R., Requena-Torres, M. A. and Stutzki, J. (2017). The outflow of gas from the Centaurus A circumnuclear disk Atomic spectral line maps from Herschel/PACS and APEX. Astron. Astrophys., 599. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746
Full text not available from this repository.Abstract
The physical state of the gas in the central 500 pc of NGC 5128 (the radio galaxy Centaurus A), was investigated using the finestructure lines of carbon [C I], [C II]; oxygen [O I], [O III], and nitrogen [N II], [N III] as well as the 12CO(4 3) molecular line. The circumnuclear disk (CND) is traced by emission from dust and the neutral gas ([C I] and 12CO). A gas outflow with a line-of-sight velocity of 60 km s(-1) is evident in both lines. The [C I] emission from the CND is unusually strong with respect to that from CO. The center of the CND (R < 90 pc) is bright in [O I], [O III], and [C II]; [O I] lambda 63 mu m emission dominates that of [C II] even though it is absorbed with optical depths tau = 1.0-1.5. The outflow is well- traced by the [N II] and [N III] lines and also seen in the [C II] and [O III] 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 (Go approximate to 4) is weak compared to the ETD starburst field (Go approximate to 40). The outflow has a much stronger radiation field (Go = 130). The total mass of all the CND gas is 9 .1 +/- 0.9 x10(7) M-circle dot 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 approximate to 2 M-circle dot yr 1, a thousand times higher than the accretion rate of the black hole. Without replenishment, the CND will be depleted in 15-120million years. However, the outflow velocity is well below the escape velocity.
Item Type: | Journal Article | ||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-237928 | ||||||||||||||||||||||||
DOI: | 10.1051/0004-6361/201629396 | ||||||||||||||||||||||||
Journal or Publication Title: | Astron. Astrophys. | ||||||||||||||||||||||||
Volume: | 599 | ||||||||||||||||||||||||
Date: | 2017 | ||||||||||||||||||||||||
Publisher: | EDP SCIENCES S A | ||||||||||||||||||||||||
Place of Publication: | LES ULIS CEDEX A | ||||||||||||||||||||||||
ISSN: | 1432-0746 | ||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/23792 |
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