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We have used the Owens Valley Millimeter Array to conduct a sensitive search for CO (1→0) emission in the radio-loud quasar 3C 48. An emission feature is detected (4 σ) at the redshift of the narrow optical emission lines (z=0.3695). The width of this feature is ∼250 km s -1 (FWHM) similar to that expected for a galactic disk, and the integrated CO line flux implies an H 2 mass of 7×10 10 M ○. (assuming the same CO to H 2 conversion factor found for giant molecular clouds in the Milky Way)

CO Emission in the Radio-loud Quasar 3C 48