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The supernova remnant (SNR) N49B in the Large Magellanic Cloud is a peculiarexample of a core-collapse SNR to show the shocked metal-rich ejecta enrichedonly in Mg without evidence for a similar overabundance in O and Ne. Based onarchival Chandra data we present results from our extensive spatially-resolvedspectral analysis of N49B. We find that the Mg-rich ejecta gas extends from thecentral regions of the SNR out to the southeastern outermost boundary of theSNR. This elongated feature shows an overabundance for Mg similar to that ofthe main ejecta region at the SNR center, and its electron temperature appearsto be higher than the central main ejecta gas. We estimate that the Mg mass inthis southeastern elongated ejecta feature is ~10% of the total Mg ejecta mass.Our estimated lower limit of >0.1 M_sun on the total mass of the Mg-rich ejectaconfirms the previously-suggested large mass for the progenitor star (M > ~25M_sun). We entertain scenarios of an SNR expanding into a non-uniform mediumand an energetic jet-driven supernova in an attempt to interpret these results.However, with the current results, the origins of the extended Mg-rich ejectaand the Mg-only-rich nature of the overall metal-rich ejecta in this SNR remainelusive.

Spatial Distribution of Mg-Rich Ejecta in LMC Supernova Remnant N49B