Hydrocarbons in Massive Star Forming Regions: C2H Observations

In order to better understand the chemical conditions and evolutionary properties of massive star-forming regions, and to explore the physical and chemical behavior of simple hydrocarbon molecules, we have used telescopes such as CSO, JCMT, CARMA and SMA, to map the multi-transitions of C₂H and HC₃N. The column densities and abundances are compared with chemical models to gain some diagnostic of the environment of the regions.