Constraints on SNIa from their remnants

Physics

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Scientific paper

High quality X-ray data from Chandra and XMM-Newton on young remnants of Type Ia supernovae (SNIa) combined with sophisticated new modelling techniques are beginning to provide potentially useful constraints on the still elusive nature of SNIa. The ejecta in a supernova remnant are heated by the passage of the reverse shock, which propagates inward and causes the metal-rich material to radiate in the X-ray band. At the densities and temperatures typical of young remnants the emission is optically thin and radiative cooling is unimportant. Therefore the X-ray emission provides a spatially resolved view of the ejecta, hundreds to thousands of years after explosion. This view allows us to assess, for example, the extent of chemical stratification in the ejecta. Furthermore the profiles of density and velocity in the ejecta, the age of the remnant, and the density of the ambient medium influence the emergent X-ray emission in complex and subtle ways. In this presentation I will review some recent studies of X-ray remnants of SNIa that bear on elucidating the physics of these explosions.

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