Measured Star Formation Efficiencies

Star formation efficiency e versus cloud mass Mc determined for a full sample of 39 clouds associated with 83 HII regions.

The cross shows typical errors of 0.3 in log10Mc and 0.4 in log10e. The diagonal dashed line shows the efficiency a cloud would have if associated with an HII region of luminosity Lmin = 400 Jy kpc2. The data are incomplete below this line. The vertical dashed line shows the molecular cloud survey completeness boundary at Mc = 4 x 105 solar masses.

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