W44: Mapping Spectral Morphology with XMM-Newton

We propose a 300 ksec observation of the canonical mixedmorphology supernovaremnant (MM SNR) W44, designed to localize and map the recentlydiscoveredoverionized plasma via its characteristic radiative recombination continuum andenhanced emission lines. XMMNewton is the only satellite with the effectivearea and spatial resolution needed to effectively find the origin of this plasmacomponent. These results will be combined with our existing efforts to createthree dimensional magnetohydrodynamic (MHD) models of MM SNR and reveal thesource of this intriguing SNR category that may account for much of theturbulence and triggered star formation in molecular clouds. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]