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Observations of Molecular and Atomic Clouds in M31

The first coordinated CO and H I observations of M31 made with identical and sufficiently high angular and velocity resolutions to resolve individual GMCs have been obtained. Extensive observations of a star-forming complex located within a portion of a spiral arm about 7 kpc from the center of M31 are reported. The distribution of both atomic and molecular gas is clearly correlated in both space and velocity. The H I line widths are typically around 25 km/s and usually a factor of two broader than CO lines detected along the same lines of sight. The molecular clouds are associated with H II regions and appear to be active sites of star formation. Comparison of H I and CO observations suggest that molecular clouds form from atomic gas on relatively short time scales within a spiral arm. 52 references.