Main content



Loading wiki pages...

Wiki Version:
Recent surveys of the Galactic plane have identified large populations of candidate young massive protostars. However, we have a very poor understanding of the actual evolutionary status of these sources. The SED based classification schemes used for nearby low mass objects are, alone, inadequate at the large distances of these high mass objects which are embedded in inhomogeneous environments. This presentation will discuss an ALMA Cycle 3 project which has provided the first comprehensive, systematic, high angular resolution survey of the chemical (and physical) properties of a well selected sample of 39 young high mass embedded sources. This survey has observed a single frequency setting in Band 6 at ∼ 1” resolution to study a range of organic molecular species which trace the evolution of the circumstellar material as a protostar initially heats its environment. The column density and excitation temperature of these species, together with the dust continuum emission, will be used to study how the properties of the circumstellar molecular gas change with source luminosity, spectral energy distribution and other properties with the goal of identifying evolutionary trends. With the recent delivery of the data for all 39 sources, this presentation will provide an overview of the survey and its initial results.