2014A&A...562A..96I


Query : 2014A&A...562A..96I

2014A&A...562A..96I - Astronomy and Astrophysics, volume 562A, 96-96 (2014/2-1)

The molecular circumnuclear disk (CND) in Centaurus A. A multi-transition CO and [CI] survey with Herschel, APEX, JCMT, and SEST.

ISRAEL F.P., GUESTEN R., MEIJERINK R., LOENEN A.F., REQUENA-TORRES M.A., STUTZKI J., VAN DER WERF P., HARRIS A., KRAMER C., MARTIN-PINTADO J. and WEISS A.

Abstract (from CDS):

This paper presents emission line intensities of CO and C° from the compact circumnuclear disk in the center of NGC 5128 (Centaurus A) obtained with the Herschel Space Observatory in the 400-1000GHz range as well as previously unpublished measurements obtained with the ground-based observatories SEST, JCMT and APEX in the 90-800GHz range. The results show that the Cen A center has an emission ladder of CO transitions quite different from those of either star-burst galaxies or (Seyfert) AGNs. In addition, the neutral carbon ([CI]) emission lines from the Cen A center are much stronger relative to the adjacent CO lines than in any other galaxy. The CO surface brightness of the compact circumnuclear disk (CND) is significantly higher than that of the much more extended thin disk (ETD) in the same line of sight. LVG analysis of the CO line profiles decomposed into the constituent contributions show that the ETD is relatively cool and of low excitation, wheres the brighter CND is hotter and more highly excited. Our PDR/XDR models suggest that most of the CND gas is relatively cool (temperatures 25K-80K) and not very dense (≃300cm–3) if it is primarily heated by UV photons. A small fraction of the gas in both the CND and the ETD has a much higher density (typically 30000cm–3). A more highly excited, high-density phase is present in the CND, either in the form of an extreme PDR or more likely in the form of an XDR. Such a phase does not occur in the part of the ETD sampled. We have determined, for the first time, the molecular mass parameters of the CND. The total gas mass of the CND is MCND=8.4x107M, uncertain by a factor of two. The CO-h2 conversion factor (XCND) is 4x1020(K.km/s)–1 also within a factor of two.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: individual: Centaurus A - galaxies: ISM - galaxies: nuclei

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4224 2
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5469 6
3 NGC 3079 Sy2 10 01 57.80342 +55 40 47.2428 11.57 11.54 10.86     ~ 1292 3
4 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1843 3
5 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 843 2
6 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1322 2
7 IC 883 SBG 13 20 35.380 +34 08 21.84   14.8       ~ 378 1
8 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4110 3
9 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3947 4
10 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2758 4
11 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1524 2
12 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 829 2

    Equat.    Gal    SGal    Ecl

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2021.07.25-17:43:08

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