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We present an analysis of the dust continuum emission at 870 um in order toinvestigate the mass distribution of clumps within infrared dark clouds(IRDCs). We map six IRDCs with the Large APEX BOlometer CAmera (LABOCA) atAPEX, reaching an rms noise level of 28-44 mJy/beam. The dust continuumemission coming from these IRDCs was decomposed by using two automatedalgorithms, Gaussclumps and Clumpfind. Moreover, we carried out single-pointingobservations of the N_2H^+ (3-2) line toward selected positions to obtainkinematic information. The mapped IRDCs are located in the range of kinematicdistances of 2.7-3.2 kpc. We identify 510 and 352 sources with Gaussclumps andClumpfind, respectively, and estimate masses and other physical propertiesassuming a uniform dust temperature. The mass ranges are 6-2692 Msun(Gaussclumps) and 7-4254 Msun (Clumpfind) and the ranges in effective radiusare around 0.10-0.74 pc (Gaussclumps) and 0.16-0.99 pc (Clumpfind). The massdistribution, independent of the decomposition method used, is fitted by apower law, dN/dM propto M^alpha, with an index of -1.60 +/- 0.06, consistentwith the CO mass distribution and other high-mass star-forming regions.

The mass distribution of clumps within infrared dark clouds. A Large APEX Bolometer Camera study