High resolution observations of the warm dust in M33

We request 9.9 hours of observing time to map M33 at 70 micron. This project will enable a spatiallyresolved investigation of HII regions in this galaxy, with the goal of determining changes 1) in the respective amount of PAH, stochastic and equilibrium dust emissions, in order to 2) constrain the radiation field and the properties of dust emission as a function of the evolutionary phase of the HII regions and across the disk of the galaxy. We will resolve the internal structure and physical properties of the HII regions down to virgul24 pc (<6), and construct spatiallyresolved, pixelbased, UVtoFIR SEDs. This proposal is a key complement to the HerM33es key project which mainly focuses on the mapping of major FIR cooling lines, with only a small fraction of the time dedicated to imaging from 100 micron to 500 micron (PACS and SPIRE). truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]