A large catalogue of molecular clouds in the southern sky
  We present a large catalogue of molecular clouds with accurate distance
estimates in the southern sky. Based on the three-dimensional (3D) dust
extinction map and the best-fit extinction and distance information of over 17
million stars presented in Guo et al., we have identified 250 dust/molecular
clouds in the southern sky using a hierarchical structure identification
algorithm. Amongst them, 71 clouds locating at high Galactic latitudes ($b <
-10^\circ$). We have estimated the distances to the clouds by fitting the
extinction versus distance profiles of the lines of sight overlapping with the
clouds using a simple Gaussian dust distribution model. The typical
uncertainties of the distances are less than 7 per$\,$cent. We also provide the
physical properties of the individual clouds, including the linear radius, mass
and surface mass density.
