EDP Sciences
Free access
Issue
A&A
Volume 376, Number 2, September II 2001
Page(s) 402 - 412
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011003


A&A 376, 402-412 (2001)
DOI: 10.1051/0004-6361:20011003

Centaurus A: Molecular gas shells or large-scale outflow?

S. J. Curran1, 2, 3

1  Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden
2  School of Physics, University of New South Wales, Sydney NSW 2052, Australia
3  European Southern Observatory, Casilla 19001, Santiago 19, Chile

(Received 2 May 2001 / Accepted 6 July 2001 )

Abstract
In order to test if the molecular "shells" observed by Charmandaris et al. (2000) could be due to a molecular outflow, we have mapped CO in $J=1\rightarrow0$ and $2\rightarrow1$ along the jet axis of Centaurus A. Where our map coincides with their observed positions, like them, we obtain $4\sigma$ detections with a similar antenna temperature for CO $1\rightarrow0$, although both transitions appear to be somewhat wider in velocity dispersion than theirs. As well as these, we have several tentative detections at distances of $\ga$5 kpc from the nucleus, and although these results are of too poor quality in order to verify or refute the shell model in favour of a molecular outflow, our observations of the inner kpc do suggest that at least a small-scale outflow is a possibility. Whether this would be a component of a larger-scale outflow or exists in conjunction with the molecular gas shells will have to wait for a much more extensive mapping of the large-scale gas distribution in Centaurus A, for which these and the results of Charmandaris et al. (2000) will hopefully provide sufficient motivation.


Key words: galaxies: active -- galaxies: jets -- galaxies: Seyfert -- galaxies: individual: Centaurus A -- galaxies: kinematics and dynamics -- galaxies: structure

SIMBAD Objects in preparation



© ESO 2001