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Astron. Astrophys. 336, 49-56 (1998)

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Star formation and the interstellar medium in low surface brightness galaxies

II. Deep CO observations of low surface brightness disk galaxies

W.J.G. de Blok * and J.M. van der Hulst

Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands (edeblok@physics.unimelb.edu.au, vdhulst@astro.rug.nl)

Received 17 July 1997 / Accepted 15 April 1998

Abstract

We present deep, pointed 12CO([FORMULA]) observations of three late-type LSB galaxies. The beam-size was small enough that we could probe different environments (HI maximum, HI mininum, star forming region) in these galaxies. No CO was found at any of the positions observed. We argue that the implied lack of molecular gas is real and not caused by conversion factor effects. The virtual absence of a molecular phase may explain the very low star formation rates in these galaxies.

Key words: galaxies: ISM – galaxies: evolution – ISM: molecules – galaxies: spiral

* Present address: School of Physics, University of Melbourne, Parkville VIC 3052, Australia

Send offprint requests to: W.J.G. de Blok

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© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998
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