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Issue A&A
Volume 411, Number 3, December I 2003
Page(s) 381 - 390
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20031399



A&A 411, 381-390 (2003)
DOI: 10.1051/0004-6361:20031399

$\mathsf{^{12}}$CO(1-0) observation of isolated late-type galaxies

S. Sauty1, F. Casoli1, A. Boselli2, M. Gerin1, J. Lequeux1, J. Braine3, G. Gavazzi4, J. Dickey5, I. Kazès6 and P. Fouqué7

1  LERMA and FRE 2460 du CNRS, Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France
2  Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France
3  Observatoire de Bordeaux, UMR 5804, CNRS/INSU, BP 89, 33270 Floirac, France
4  Università degli Studi di Milano-Bicocca, Dipartimento di Fisica, Piazza dell'Ateneo Nuovo 1, 20126 Milano, Italy
5  Department of Astronomy, University of Minnesota, 116 Church Street, SE, Minneapolis, MN 55455, USA
6  GEPI, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
7  ESO - European Southern Observatory, 3107 Alonso de Cordova, Casilla 19001 Santiago, Chili

(Received 3 December 2002 / Accepted 7 September 2003)

Abstract
We present 12CO( J=1-0) line observations of 99 galaxies obtained with the SEST 15 m, the Kitt Peak 12 m and the IRAM 30 m telescopes. The target galaxies were selected from the catalogue of isolated galaxies of Karachentseva (1973). These data are thus representative of the CO properties of isolated late-type galaxies. All objects were observed in their central position, those with large angular sizes were mapped. These new measurements are used to estimate the molecular gas mass of the target galaxies. The molecular gas is on average ~18% of the atomic gas mass.


Key words: galaxies: spiral -- ISM -- intergalactic medium -- star formation -- radio lines: galaxies

Offprint request: A. Boselli, Alessandro.Boselli@oamp.fr

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