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We present observations of 1.2-mm dust continuum emission, made with theSwedish ESO Submillimeter Telescope, towards eighteen luminous IRAS pointsources, all with colors typical of compact HII regions and associated withCS(2-1) emission, thought to be representative of young massive star formingregions. Emission was detected toward all the IRAS objects. We find that the1.2-mm sources associated with them have distinct physical parameters, namelysizes of 0.4 pc, dust temperatures of 30 K, masses of 2x10^3 Msun, columndensities of 3x10^23 cm^-2, and densities of 4x10^5 cm^-3. We refer to thesedust structures as massive and dense cores. Most of the 1.2-mm sources showsingle-peaked structures, several of which exhibit a bright compact peaksurrounded by a weaker extended envelope. The observed radial intensityprofiles of sources with this type of morphology are well fitted with power-lawintensity profiles with power-law indices in the range 1.0-1.7. This resultindicates that massive and dense cores are centrally condensed, having radialdensity profiles with power-law indices in the range 1.5-2.2. We also find thatthe UC HII regions detected with ATCA towards the IRAS sources investigatedhere (Paper I) are usually projected at the peak position of the 1.2-mm dustcontinuum emission, suggesting that massive stars are formed at the center ofthe centrally condensed massive and dense cores.

A multiwavelength study of young massive star forming regions: II. The dust environment