A model grid for the spectral analysis of X-ray ejecta emission in young Type Ia SNRs

Different Type Ia supernova explosion mechanisms lead to very different thermal X-ray spectra from the shocked ejecta in young SNRs. Modeling of the hydrodynamic evolution and ionization and electron heating processes within the shocked plasma yields spectra where contributions from key elements like Fe, Ca and Si are sensitive to the kind of explosion that originated the supernova. This has two consequences. First, it is possible to use SNRs as diagnostic tools to discriminate among different Type Ia SN explosion models. Second, it is necessary to use realistic SNR models in order to understand and interpret X-ray spectra of young Type Ia SNRs. We will present an extensive grid of models for the shocked ejecta emission in Type Ia SNRs, designed by us to facilitate spectral analysis. Relevant parameters like line ratios, line centroids, ionization timescales and electron temperatures will be discussed in the framework of the model grid. Spectral analysis of the ejecta emission from the Tycho SNR will be presented as a practical example. Prospects for future improvement of the models will also be addressed.