Fig. 4

Mass-size plots for clumps extracted with Gaussclumps (left panel) and Clumpfind (right panel) for all clumps in our IRDCs. The solid lines represent the empirical lower limit threshold for high-mass star formation found by Kauffmann & Pillai (2010), while the dashed lines represent the theoretical minimum threshold of 1 g cm-2 proposed by Krumholz & McKee (2008). Blue filled squares represent clumps associated with any of the following signposts of star formation: IRAS/MSX/24-μm point sources, masers, HII regions, and/or UCHII regions. Crosses represent clumps with no reported signpost of star formation.
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