Spatial Distribution of Nucleosynthesis Products in Cassiopeia A:   Comparison Between Observations and 3D Explosion Models
  We examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D explosion models and spatial distribution of elements in 3D models with those derived from X-ray observations. We also examine the cospatial production of 26Al with other species. We find that the most reliable indicator of the presence of 26Al in unmixed ejecta is a very low S/Si ratio (~0.05). Production of N in O/S/Si-rich regions is also indicative. The biologically important element P is produced at its highest abundance in the same regions. Proxies should be detectable in supernova ejecta with high spatial resolution multiwavelength observations. 
Patrick Young (1,3), Carola I. Ellinger (1,3), Francis X. Timmes   (1,3), David Arnett (7), Christopher L. Fryer (1,2), Gabr...