Contribution Contributed Talk
Chemical diversity in the star-forming complex W33
The W33 complex is an ideal object to study high-mass star formation since it contains molecular clouds in different evolutionary stages within a small area on the sky. The molecular clouds in W33 are located at similar distances (~2.4 kpc) and probably contained the same birth material. Thus, a comparative chemical study of these clouds along an evolutionary sequence (from quiescent dark clouds to active H II regions) is feasible. I will present spectral line mosaic observations of six W33 clouds with the Submillimeter Array (SMA) at 230 GHz and the Atacama Pathfinder Experiment (APEX) telescope at 280 GHz, tracing the chemical composition of the clouds on different scales. The spectra of both datasets show significant differences in the chemistry of the clouds, supporting the identification of different evolutionary stages in the complex. In addition, I will discuss integrated intensity ratios of N2H+/CS that show clear trends as a function of evolutionary stage, luminosity-to-mass ratio, and H2 peak column density.