Abstract
We conducted high-sensitivity, high-velocity resolution CO(1–0) observations in a region containing a portion of the diffuse molecular cloud MBM 53 to determine whether weak CO emission was present. The results of our observations increase the amount of CO-detectable molecular gas in the region by a factor of 2. The increased molecular mass for the cloud, if applicable to the molecular clouds in the entire Pegasus–Pisces region, decreases the dark molecular gas content from 58 per cent of the total H2 mass to ∼30 per cent. If the results for MBM53 are applicable to other diffuse clouds, then the fraction of dark gas directly detectable via sensitive CO(1–0) observations in diffuse molecular clouds is similar to that predicted by models for giant molecular clouds.
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