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We observed three high-mass star-forming regions in the W3 high-mass starformation complex with the Submillimeter Array and IRAM 30 m telescope. Theseregions, i.e. W3 SMS1 (W3 IRS5), SMS2 (W3 IRS4) and SMS3, are in differentevolutionary stages and are located within the same large-scale environment,which allows us to study rotation and outflows as well as chemical propertiesin an evolutionary sense. While we find multiple mm continuum sources towardall regions, these three sub-regions exhibit different dynamical and chemicalproperties, which indicates that they are in different evolutionary stages.Even within each subregion, massive cores of different ages are found, e.g. inSMS2, sub-sources from the most evolved UCHII region to potential starlesscores exist within 30 000 AU of each other. Outflows and rotational structuresare found in SMS1 and SMS2. Evidence for interactions between the molecularcloud and the HII regions is found in the 13CO channel maps, which may indicatetriggered star formation.

Different Evolutionary Stages in the Massive Star Forming Region W3 Main Complex