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We present 12CO J = 1-0 and J = 2-1 observations of the low metallicity (12 +log(O/H) = 7.74) Local Group dwarf irregular galaxy WLM made with the 15 m SESTand 14 m FCRAO telescopes. Despite the presence a number of HII regions, wefind no CO emission. We obtain low upper limits on the integrated intensity(I(CO) >= 0.18 K km/s for CO (1-0)). The non-detection is consistent with theresult of Taylor, Kobulnicky and Skillman (1998), that dwarf galaxies below ametallicity of ~ 7.9 are not detected in CO emission. WLM shows that this trendcontinues for low metallicity galaxies even as their metallicities approach7.9. These results are consistent with the models of the metal poor ISM byNorman and Spaans (1997). By comparing our CO data with observations of starformation in WLM, we find evidence for a high CO to H$_2$ conversion factor.Comment: 11 pages, 3 figures, accepted by A&

A search for CO in the Local Group dwarf irregular galaxy WLM