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We present sensitive CO (J = 1→ 0) emission line observations of three metalpoor dwarf irregular galaxies Leo P (Z∼3% Z ), Sextans A (Z∼7.5% Z ), and Sextans B (Z∼7.5% Z ), all obtained with the Combined Array for Millimeterwave Astronomy (CARMA) interferometer. While no CO emission was detected, the proximity of the three systems allows us to place very stringent (4σ) upper limits on the CO luminosity (LCO) in these metal-poor galaxies. We find the CO luminosities to be LCO < 2900 K km/s pc 2 for Leo P, LCO < 12400 K km s −1 pc for Sextans A, and LCO < 9700 K km s −1 pc for Sextans B. Comparison of our results with recent observational estimates of the factor for converting between LCO and the mass of molecular hydrogen, as well as theoretical models,

CARMA CO OBSERVATIONS OF THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES