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Using our deep ~120 ks Chandra observation, we report on the results from ourspatially-resolved X-ray spectral analysis of the "oxygen-rich" supernovaremnant (SNR) 0540-69.3 in the Large Magellanic Cloud. We conclusivelyestablish the nonthermal nature of the "arcs" in the east and west boundariesof the SNR, which confirms the cosmic-ray electron acceleration in thesupernova shock (B ~ 20-140 microG). We report tentative evidence for Feoverabundance in the southern region close to the outer boundary of the SNR.While such a detection would be intriguing, the existence of Fe ejecta is notconclusive with the current data because of poor photon statistics and limitedplasma models. If it is verified using deeper X-ray observations and improvedplasma models, the presence of Fe ejecta, which was produced in the core of thesupernova, near the SNR's outer boundary would provide an intriguingopportunity to study the explosive nucleosynthesis and the ejecta mixing inthis young core-collapse SNR. There is no evidence of X-ray counterparts forthe optical O-rich ejecta in the central regions of the SNR.

A Deep Chandra Observation of the Oxygen-Rich Supernova Remnant 0540-69.3 in the Large Magellanic Cloud