Asymmetry in The Observed Metal-Rich Ejecta of Galactic Type Ia   Supernova Remnant G299.2-2.9
  We have performed a deep Chandra observation of Galactic Type Ia supernova remnant G299.2-2.9. Here we report the initial results from our imaging and spectral analysis. The observed abundance ratios of the central ejecta are in good agreement with those predicted by delayed-detonation Type Ia supernovae models. We reveal inhomogeneous spatial and spectral structures of metal-rich ejecta in G299.2-2.9. The Fe/Si abundance ratio in the northern part of the central ejecta is higher than that in the southern part. An elongation of ejecta material extends out to the western outermost boundary of the remnant. In this western elongation, both the Si and Fe are enriched with a similar abundance ratio to that in the southern part of the central nebula. These structured distributions of metal-rich ejecta material suggest that this Type Ia supernova might have undergone a significantly asymmetric explosion and/or has been expanding into a structured medium. 
Seth Post, Sangwook Park, Carles Badenes, David N. Burrows, John P.   Hughes, Jae-Joon Lee, Koji Mori, Patrick O. Slane
astro-ph.HE