A large catalogue of molecular clouds in the southern sky

Abstract

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 percent. We also provide the physical properties of the individual clouds, including the linear radius, mass and surface mass density.

11 pages, 10 figures, 2 tables, accepted for publication in MNRAS

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• Hierarchical Clustering in Astronomy
• Distances to nearby molecular clouds traced by young stars
• New method for estimating molecular cloud distances based on Gaia, 2MASS, and the TRILEGAL galaxy model