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Title:
Centaurus A: Molecular gas shells or large-scale outflow?
Authors:
Curran, S. J.
Affiliation:
AA(Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden; School of Physics, University of New South Wales, Sydney NSW 2052, Australia; European Southern Observatory, Casilla 19001, Santiago 19, Chile)
Publication:
Astronomy and Astrophysics, v.376, p.402-412 (2001) (A&A Homepage)
Publication Date:
09/2001
Origin:
A&A
A&A Keywords:
GALAXIES: ACTIVE, GALAXIES: JETS, GALAXIES: SEYFERT, GALAXIES: INDIVIDUAL: CENTAURUS A, GALAXIES: KINEMATICS AND DYNAMICS, GALAXIES: STRUCTURE
DOI:
10.1051/0004-6361:20011003
Bibliographic Code:
2001A&A...376..402C

Abstract

In order to test if the molecular ``shells'' observed by Charmandaris et al. (\cite{ccv00}) could be due to a molecular outflow, we have mapped CO in J=1->0 and 2->1 along the jet axis of Centaurus A. Where our map coincides with their observed positions, like them, we obtain 4sigma detections with a similar antenna temperature for CO 1->0, 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. (\cite{ccv00}) will hopefully provide sufficient motivation. Based on results collected at the European Southern Observatory, La Silla, Chile.
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