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We present a deep spectroscopic search for CO emission in the dwarf irregulargalaxy DDO154, which has an Oxygen abundance of only 1/20 the solar value. Theobservations were conducted in order to constrain the CO-to-$\mathrm{H_2}$conversion factor at low metallicity. No CO was detected, however, despitebeing one of the sensitive observations done towards galaxies of this type. Wesucceed in putting a strong lower limit on the conversion factor, at least 10times the Galactic value. Our result supports previous studies which argue fora high conversion factor at low metallicity.

Deep CO Observations and the CO-to-H_2 Conversion Factor in DDO 154, a Low Metallicity Dwarf Irregular Galaxy